The hypothesis of the explosion of a number of planets and moons of our solar system during its 4.6-billion-year history is in excellent accord with all known observational constraints, even without adjustable parameters.

Many of its boldest predictions have been fulfilled. In most instances, these predictions were judged highly unlikely by the several standard models the eph would replace. And in several cases, the entire model was at risk to be falsified if the prediction failed.

The successful predictions include:

Where It Began – the Titius-Bode Law of Planetary Spacing
In the latter half of the 18th century, when only six major planets were known, interest was attracted to the regularity of the spacing of their orbits from the Sun.

The table shows the Titius-Bode law of planetary spacing, comparing actual and formula values. This in turn drew attention to the large gap between Mars and Jupiter, apparently just large enough for one additional planet.

Today we know of tens of thousands of “minor planets” or asteroids with planet-like orbits at that average mean distance from the Sun.

Titius-Bode Law of Planetary Spacing Planet Distance Formula Mercury 0.4 0.5 Venus 0.7 0.7 Earth 1.0 1.0 Mars 1.5 1.6 ? — 2.8 Jupiter 5.2 5.2 Saturn 9.5 10 Uranus 19.2 19.6 Neptune 30.1 38.8 Formula: distance in au =0.4+0.3*2(n-2)

With the discovery of the second asteroid in 1802, Olbers proposed that many more asteroids would be found because the planet that belonged at that distance must have exploded.

This marked the birth of the exploded planet hypothesis. It seemed the most reasonable explanation until 1814, when Lagrange found that the highly elongated orbits of comets could also be readily explained by such a planetary explosion.

That, unfortunately, challenged the prevailing theory of cometary origins of the times, the Laplacian primeval solar nebula hypothesis. Comets were supposed to be primitive bodies left over from the solar nebula in the outer solar system. This challenge incited Laplace supporters to attack the exploded planet hypothesis (eph).

Lagrange died in the same year, and support for his viewpoint died with him when no one else was willing to step into the line of fire.

Newcomb’s Objection – All Asteroids Can’t Come From One Planet 
In the 1860s, Simon Newcomb suggested a test to distinguish the two theories of origin of the asteroids.

If they came from an exploded planet, all of them should reach some common distance from the Sun, the distance at which the explosion occurred, somewhere along each orbit. But if asteroids came from the primeval solar nebula, then roughly circular, non-intersecting orbits ought to occur over a wide range of solar distances between Mars and Jupiter.

Newcomb applied the test and determined that several asteroids had non-intersecting orbits. He therefore concluded that the solar nebula hypothesis was the better model. Newcomb’s basic idea was a good one. But only a few dozen asteroids were known at the time, and Newcomb did not anticipate several confounding factors for this test.

Because Newcomb didn’t realize how many asteroids would eventually be found, he didn’t appreciate the frequency of asteroid collisions, which tend (on average) to circularize orbits.

He also did not appreciate that planetary perturbations, especially by Jupiter, can change the long-term average eccentricity (degree of circularity) of each asteroid’s orbit. Finally, Newcomb did not consider that more than one planet might have exploded, contributing additional asteroids with some different mean distance. In Newcomb’s time, no evidence existed to justify these complications.

When Newcomb’s test is redone today, the result is that an explosion origin is strongly indicated for main belt asteroids. In fact, the totality of evidence indicates two exploded parent bodies,

This article will review that evidence.

Where Did All the Mass Go?
Although over 10,000 asteroids have well-determined orbits, the combined mass of all other asteroids is not as great as that of the largest asteroid, Ceres.

That makes the total mass of the asteroid belt only about 0.001 of the mass of the Earth. A frequently asked question is, if a major planet exploded, where is the rest of its mass?
Consider what would happen if the Earth exploded today. Surface and crustal rocks would shatter and fragment, but remain rocks. However, rocks from depths greater than about 40 km are under so much pressure at high temperature that, if suddenly released into a vacuum, such rocks would vaporize. As a consequence, over 99% of the Earth’s total mass would vaporize in an explosion, with only its low-pressure crustal and upper mantle layers surviving.The situation worsens for a larger planet, where the interior pressures and temperatures get higher more quickly with depth. In fact, all planets in our solar system more massive than Earth (starting with Uranus at about 15 Earth masses) are gas giants with no solid surfaces, and would be expected to leave no asteroids if they exploded.

Bodies smaller than Earth, such as our Moon, would leave a substantially higher percentage of their mass in asteroids. But the Moon has only about 0.01 of Earth’s mass to begin with.

In short, asteroid belts with masses of order 0.001 Earth masses are the norm when terrestrial-planet-sized bodies explode. Meteorites provide direct evidence for this scenario of rocks either surviving or being vaporized.

Various chondrite meteorites (by far the most common type) show all stages of partial melting from mild to almost completely vaporized. Indeed, it is the abundant melt droplets, called “chondrules”, that give chondrite meteorites their name.

Modern Evidence for Exploded Planets
Two important lines of evidence that asteroids originated in an explosion are the explosion signatures (described later in this article), and the rms velocity among asteroids, which is as large as is allowed by the laws of dynamics for stable orbits.

In other words, the asteroid belt is certainly the remnant of a larger population of bodies, many of which gravitationally escaped the solar system or collided with the Sun or planets.

Two important lines of evidence that meteoroids originated in an explosion are:

Comets are so strikingly similar to asteroids that no defining characteristic to distinguish one from the other has yet been devised. This is rather opposite to expectations of the solar nebula hypothesis, because comets should have been formed in the outer solar system far from the main asteroid belt.

A traceback of orbits of “new” comets (that have not mixed with the planets before) indicates statistically that these probably originated at a common time and place, 3.2 Mya. ^[i]

But it should be noted that galactic tidal forces would eliminate comets from any bodies that exploded prior to 10 Mya, so only very recent explosions can produce comets that would remain visible today.

A major explosion would send a blast wave through the solar system, blackening exposed, airless surfaces in its path.

Most such solar system surfaces are indeed blackened, even for icy satellites. But a few cases have such slow rotation that only a little over half of the moon gets blackened.

Saturn’s moon Iapetus is one such case, because its rotation period is nearly 80 days long. Figure 1 shows a spacecraft image of Iapetus. One side is icy bright; the other is coal black. The difference in albedo is a factor of five. Gray areas are extrapolations of black areas into regions not yet photographed. As such, they represent a prediction of what will be seen when a future spacecraft (Cassini?) completes this photography.

Perhaps the most basic explosion indicator is that all fragments of significant mass will trap smaller nearby debris from the explosion into satellite orbits. So explosions tend to form asteroids and comets with multiple nuclei of all sizes. Collisions, by contrast, normally cannot produce fragments in orbits because any debris orbits must lead either to escape or to re-collision with the surface.

Moreover, collisions tend to cause existing satellites to escape, leading to asteroid “families” (many of which are seen). Our prediction that asteroids and comets would often be found to have satellites has been confirmed in recent years.

The first spacecraft finding (by Galileo) was of moon Dactyl orbiting asteroid Ida in 1993. More recently, Hubble imagery found that Comet Hale-Bopp has at least one, and possibly three or more, secondary nuclei. ^[ii]

Over 100 additional lines of evidence related to the eph and the standard models it would replace are summarized in ^[iii].

Did More Than One Planet Explode?
Many lines of evidence suggest more than one planetary explosion in the solar system’s history.

The discovery of one, and probably two, new asteroid belts orbiting the Sun beyond Neptune is especially suggestive, given that the main asteroid belt is apparently of exploded planet origin. Evidence of the “late heavy bombardment” in the early solar system is another strong indicator. These points are discussed later in this article.

On Earth, geological boundaries are accompanied by mass extinctions at five epochs over the last billion years. Two of the most intense of these, the P/T boundary about 250 Mya, and the K/T boundary (and the extinction of dinosaurs) at 65 Mya, are the most likely to be associated with the damage to Earth’s biosphere expected from a major planet explosion.

Meteorites provide direct evidence about their parent bodies. Yet this evidence strongly indicates at least 3-4 distinct parent bodies. Oxygen isotope ratios are generally similar for related planetary bodies, such as all native Earth and Moon rocks. These ratios for meteorites require at least two distinct, unrelated parent bodies, and probably more.

Cosmic ray exposure ages of meteorites indicate how long these bodies have been exposed to space, because cosmic rays can penetrate only about a meter into a solid body. Collisional break-up can reset the exposure ages for some meteorites, and produce “double exposure” or other complexities for others.

The data show clusterings of exposure ages around several different primary epochs, suggesting multiple explosion epochs.

Main belt asteroids come in many types, but most of these are sub-type distinctions. 80% of all main belt asteroids are of type C (“carbonaceous”), and most of the remaining 20% are of type S (“silicaceous”). The former are found predominately in the middle and outer belt, while the latter are mostly in the inner belt, the part that lies closest to Mars. These two types are unlikely to have had the same parent body.

Finally, it should be noted that we can estimate the total mass of the body that exploded to produce all the comets seen today. (The lifetime of those comets is limited to 10 million years by galactic tidal forces and planetary perturbations.)

That parent body mass is almost certainly less than the size of our Moon, because the carbonaceous meteorites most closely associated with comets indicate a parent body that was too small to chemically differentiate.

Explosion Signatures in the Main Asteroid BeltIn Figure 2, we show a plot of average orbital eccentricity (called “proper eccentricity”) versus average mean distance (called “proper semi-major axis”) for thousands of main-belt asteroids.

We included the numbered asteroids having periods between one-half and one-third the period of Jupiter. If the primeval solar nebula hypothesis were correct, numbers of asteroids with near-zero eccentricity would be roughly equal at all mean distances well away from the orbits of Mars and Jupiter.

Indeed, nebular drag and collisions would ensure that orbits with zero eccentricity were preferred. By contrast, if the exploded planet hypothesis is correct, a minimum eccentricity, increasing to either side of a mean distance of about 2.8 au, should be evident in the plot.

The “V”-shaped line shows the theoretical minimum eccentricity, according to the eph.

We see in Figure 2 that, despite about as much scattering across the minimum line as expected (increasing toward Jupiter on the right), the densest number counts trend up and away, paralleling the V-shaped line, on both sides of the inferred exploded planet distance, 2.82 au.

It is difficult to imagine this explosion-predicted low-eccentricity avoidance occurring by chance – especially since the primeval solar nebula hypothesis predicts a preference for low eccentricity values.

What we are seeing here is Newcomb’s argument applied with modern knowledge and data. The expected characteristic of fragments that originated in an explosion is seen. The expected characteristic of objects present since the solar system’s beginning, even if only collisional fragments thereof, is not seen.

Astonishingly, a great many comets are discovered that have energy parameter values close to zero, the threshold of gravitational escape, in units where Earth’s energy parameter is –100,000. Before mixing with the planets, a clustering of energy parameters near –5 exists, as shown in the left half of Figure 3.

However, as these same comets recede again far from the planets, the clustering property is virtually destroyed, as shown on the right side of Figure 3. The scattering is so great that no clustering near –5 or any other value will exist the next time around. So these comets must have been making their first visit to the planetary part of the solar system. For that reason, they are called “new comets”.

These new comets, first noted by Oort, were notthe belt of comets beyond Pluto expected by the primeval solar nebula hypothesis. They arrive from all directions on the sky, with no tendency to be concentrated toward the plane of the planets. Also, they move in directions opposite to the planets as often as in directions consistent with the planets.

Because of these traits and a mean distance of 1000 times greater than that of Pluto from the Sun, the far-away source of Oort’s new comets was designated the “Oort cloud”.

The exploded planet hypothesis predicted something similar.

The energy parameter implies a particular period of revolution around the Sun. If a planet exploded “x” years ago, then new comets returning for the first time today would arrive on orbits with period “x”. Comets with shorter periods would have returned in the past, mixing with the planets and eventually being eliminated (or now in the process of being eliminated).

Comets with longer periods would not yet have returned for the first time. So the eph predicts that all new comets should have the same period “x”, and therefore the same energy parameter corresponding to a period of “x”.

The center of the spike on the left side of Figure 3 corresponds to a period of 3.2 million years, which is therefore the time since the last explosion event.

In the 1970s, astronomer Opik devised a test to determine if the Oort cloud really existed, or if the “clustering” was really a spike, as predicted by the exploded planet hypothesis.

The published orbits of new comets have an orbit quality parameter, which indicates which orbits ought to be very accurate because of a long observed arc with lots of well-distributed observations (class 1A); and which orbits ought to have higher observational errors because of short arcs and/or fewer or poorly distributed observations (classes 1B, 2A and 2B).

In the standard model with an Oort cloud of comets, there is no obvious way to tell the difference between comets anywhere in the energy parameter range on the left side of Figure 3. So there is no reason for any observational class of comet to be other than randomly distributed among all the comets in that figure. If all the orbits could be improved to class 1A, the overall average appearance of the distribution ought to be unchanged.

However, in the eph, the real distribution would have all the comets in a single bin, and all the observed spread of energy parameter values would be due to observational error.

So comets of observational classes 1B, 2A and 2B ought to have a broader distribution than class 1A comets because 1A comet orbits are closer to reality (less observational error).

And if all the comets of classes 1B, 2A and 2B were improved to class 1A, the whole distribution should narrow greatly. Opik’s test was to separate comets of class 1A from the other classes to determine if the distribution was significantly broader for the other classes than for class 1A (indicating theeph is right), or essentially the same for both groups (indicating the Oort cloud is right).

The results are shown on the left side of Figure 4 for new class 1A comets and on the right side of the same figure for new comets of classes 1B, 2A and 2B.

(Note that these orbit quality codes are assigned by cometary astronomers using published criteria. This author had no role in determining these designations.)

The left side shows 2.6 times as many comets in the central spike as in the immediately adjoining bins combined. The right side shows only 0.8 times as many comets in the central spike as in the two adjoining bins, and has a clearly broader distribution.

The Opik test is cleanly passed by the exploded planet hypothesis (eph), but not by the Oort cloud model.

Anyone working with the published new comet data could arrive at the same conclusion. If skeptical readers suspect that the author may have consciously or unconsciously selected the data so as to give a favorable outcome, recall that Opik, who strongly doubted the eph when he thought of this test, came to the same conclusion even with the smaller amount of comet data available to him 20 years ago.

In essence, we have proved that Lagrange’s instinct 200 years ago was right on target:

Satellites of Asteroids and Comets

If asteroids and comets are the products of accretion from a nebula, or even from collisional break-ups, they will invariably be isolated single bodies because their gravitational fields are too weak to effect captures.

For example, in a break-up event, most debris escapes, and what does not falls back onto the surface it was ejected from after one orbit. Even if it managed to barely miss the surface, tidal forces would bring it back down in short order.

By contrast, in the eph, space is filled with debris just after the explosion. Large fragments will find lots of debris inside their gravitational spheres of influence, and these will remain in stable orbits as permanent satellites of these larger fragments. For that reason, I presented papers at the International Astronomical Union meeting in Argentina in 1991, and the Flagstaff meeting of asteroid, comet, and meteorite experts in that same year, pointing out the eph prediction.

Specifically, spacecraft visiting asteroids (or comets) should find at least one of the larger debris bodies (satellites) in orbit around the asteroid (or comet) primary nucleus. This prediction, also published in ^[iii] and ^[iv], was considered extremely unlikely by mainstream astronomers, one of whom made a public wager with me that it would not happen.

The Galileo spacecraft flew by asteroid Ida in 1993, and returned images showing a 1-km satellite (now named Dactyl) in a stable orbit around its nucleus. Since that discovery, two telescopic discoveries of satellites of other asteroids have been made. ^[v] This supplements occultation and radar evidence of long standing suggesting asteroid satellites.

A year before the NEAR spacecraft went into orbit around asteroid Eros in February 2000, I altered the general prediction of satellites to a more specific one: If the gravity field of an asteroid is too irregular for stable orbits to exist near the synchronous orbit (as is the case for Eros), then the debris that once orbited the nucleus would now be found as intact boulders lying on the asteroid surface. ^[vi]

These would be easy to identify because of their tangential touchdown onto the asteroid, resulting in considerable rolling from their orbital momentum.

So “roll marks” were the predicted identifier to show that boulders were former satellites.

The first image taken by the spacecraft from orbit around Eros is shown in Figure 5.

The two blocks are areas where contrast was stretched for better visibility of the “roll mark”. The image appears to show a track starting in a random location, going up the outside wall of a crater, down the inside wall, and ending in a 50-meter boulder. Many additional examples of boulders, tracks, and boulders at the ends of tracks can be seen in later spacecraft images.

In the meantime, evidence for comet satellites was mounting as well. The Giotto spacecraft was the first to approach a comet, where it found “brightness concentrations” in the inner coma referred to as “dust spikes”. ^[vii] Then Hubble Space Telescope observations of Comet Hale-Bopp showed at least one, and probably three secondary nuclei orbiting the primary comet nucleus. ^[ii]

Although this finding was controversial, the satellite interpretation was subsequently confirmed as the most reasonable explanation by other investigators.^[viii]

The largest of these secondary bodies is a 30-km satellite of an estimated 70-km primary nucleus.

Comet Split Velocities 
Another strong test distinguishing the eph from the standard models comes from comet split-velocity data.

The eph leads to what I call the “satellite model” as an explanation of what a comet is and how it behaves. The standard model for comets is the so-called “dirty snowball” model. In the former case, comets are rocky asteroids surrounded by a debris cloud. In the latter case, they are a snow-ice mixture contaminated with dust packed into a lone nucleus that is eruptive when exposed to sunlight.

It ought to be easy to distinguish these two extreme possibilities from observations. And indeed, it is. One of the strongest such tests follows.

Some comets are observed to “split” into two or more comets. That was unexpected behavior in the dirty snowball model, but is explained after the fact as the breaking apart of the snowy nucleus under the action of strong jets.

“Splitting” is required by the satellite model because, as the comet approaches the Sun and its gravitational sphere of influence shrinks, some outer satellites may find themselves outside the sphere of influence. Such objects then escape into independent solar orbits. The escape event will appear to a distant observer as a “split” of the comet into two or more pieces.

The test involves the velocity of the fragment comets relative to the original comet from which they split. In the dirty snowball model, the velocity is the result of jet action. The energy source might be entirely internal to the comet, in which case the velocity of ejection of split comet fragments will be independent of the distance from the Sun at which the split occurs.

Alternatively, the energy for the split in the dirty snowball model might come from solar light, solar heat, solar wind, solar magnetism, or somethingassociated with the Sun. In all such cases, the energy ought to increase inversely with the square of solar distance, which will yield relative velocities that are inverse with solar distance to the first power.

The dirty snowball model, because it does not predict such splits, is not specific about which mechanism, a solar or a non-solar energy source, is the correct one.

By contrast, the eph and its satellite model require gravitational escapes of satellite comets as the sphere of influence of the primary nucleus shrinks upon approach to the Sun.

The laws of dynamics require that “split” fragment velocities be escape velocities, which vary inversely with the square root of solar distance. Any other observed relationship would falsify the model.

In Figure 6, we show a plot of split-comet component relative velocities, V, versus solar distance of the comet in astronomical units at the time of splitting, R, on a log-log scale. The data and its one-sigma spread lie within the shaded region. For comparison, three theoretical curves are shown, labeled “C”, “S”, and “E”.

These represent a comet-internal energy source, a solar energy source, and gravitational escape energies as predicted by the eph, respectively. All curves have been shifted vertically to intersect at 1 au (about 150 million kilometers) because only the slopes are relevant.

It is apparent that the theoretical curve predicted by the eph model falls within the one-sigma data region, and is therefore fully in accord with the observations. Both of the possibilities for the dirty snowball model fall well outside the data range by at least four sigma. This means the dirty snowball model is excluded as an explanation at the statistical level of better than 10,000-to-1.

In summary, we see that the satellite model for the nature of comets, based on the eph model for the origin of comets, is consistent with the observational data; whereas the standard model is strongly excluded by the data.

The Late Heavy Bombardment 
Planetary and moon explosions are not just a recent phenomenon.

There is direct evidence for the explosion of one or more very large planets in the very early solar system. From studies of lunar rocks it is now known thatthe Moon, and presumably the entire solar system with it, underwent a “late heavy bombardment” of unknown origin not long after the major planets formed.

The following are relevant descriptions of the event: ^[ix]

In short, the late heavy bombardment, a real solar system event, sounds like an early planetary explosion event.

The K/T Boundary Event at 65 Mya
The following documented geological events at the terrestrial K/T boundary at 65 Mya can easily be associated with a planetary explosion event, most likely the explosion of “Planet V” near the present-day orbit of Mars.

This last point might need some clarification.

If an event occurs at a great distance from the Earth, it would potentially affect just one hemisphere of the Earth if it is a quite sudden phenomenon. But if it lasts for more than 12 hours, as would occur for the spread in arrival times of a blast wave from a distant planet explosion, then the Earth would rotate on its axis, exposing most parts of the planet to the event.

However, because of the tilt of the Earth’s axis to the mean plane of the planets, one polar region of Earth would remain continuously hidden from such an event unless its duration continued over many months. For the K/T boundary event, apparently one of Earth’s polar regions has shielded.

This emphasizes the likelihood that the event was of distant origin and global extent, rather than terrestrial origin and concentrated mainly in one area (as for a single major impact such as the Chicxulub crater formation in the Yucatan).

Mars May Be a Former Moon of a Now-Exploded Planet 
Evidence that Mars is a former moon:

The above summarizes evidence that Mars was not an original planet, but rather a moon of a now-exploded planet occupying that approximate orbit.

Many of these points are the expected consequences of having a massive planet blow up nearby, thereby blasting the facing hemisphere and leaving the shielded hemisphere relatively unscathed.

Especially significant in this regard is the fact that half of Mars is saturated with craters, and half is only sparsely cratered.

Moreover, the crustal thickness has apparently been augmented over one hemisphere by up to 20 km or so, gradually tapering off near the hemisphere boundaries. This “crustal dichotomy” is also readily seen in Martian elevation maps, such as in Figure 7.

The Original Solar System 
Putting all this evidence together, we have strong hints for two original planets near what is now the main asteroid belt: hypothetical “Planet V” and “Planet K”.

These were probably gas giant planets with moons of significant size, such as Mars, before they exploded.

We have hints of two more asteroid belts, probably from the explosions of two more planets (“Planet T” and “Planet X“) beyond Neptune. And we have hints for two extra-large gas giant planets, “Planet A” and “Planet B”, that exploded back near the solar system beginning.

Of the existing nine major planets today, we have strong evidence that Mercury is an escaped moon of Venus^[xi], Mars is an escaped moon of Planet V, and Pluto and its moon Charon are escaped moons of Neptune^[xii]. If we eliminate these, then perhaps the original solar system consisted of 12 planets arranged in 6 “twin” pairs. Such an arrangement would be consistent with origin of all major planets and moons by the fission process. ^[xiii]

This model makes a major prediction that will soon be tested: Extrasolar planets should arise in twin pairs also, with 2-to-1 orbital period resonances common.

If so, then many cases that now appear to be single massive planets on highly elliptical orbits will turn out, when enough observations are accumulated, to be twin resonant planets on near-circular orbits.

Planetary Explosion Mechanisms 
The most frequently asked question about the eph is “What would cause a planet to explode?”

We will mention three theoretical conjectures, although in-depth work must await a wider recognition of the phenomenon in the field at large.

Conclusion

We have covered most of the successful predictions of the exploded planet hypothesis mentioned in the abstract:

Two additional successes and one additional new prediction will be mentioned briefly here.

This refers to an obvious corollary of the eph, never explicitly put in writing in so many words.

If meteorites come from the explosion of planet-sized bodies, the water from such bodies can be ocean water (as on Earth and as suspected for Jupiter’s moon Europa), and would therefore be expected to contain salt from run-off of minerals from solid portions of the planet.

Only recently has meteorite water been tested for salt content for the first time, with the surprising result that sodium chloride was found. ^[xvii] Certain aspects of this discovery suggest that water was flowing on the parent body from which the meteorite came.

True, unless one had the exploded planet hypothesis in mind.

Supplementing the idea of salt water in meteorites, we did explicitly predict salt water in comets. ^[xviii]

Esko Lyytinen of Finland used the exploded planet hypothesis as a model for understanding and predicting the behavior of meteor storms.

These had never before been successfully predicted. Although nearly a dozen professional astronomers attempted predictions for the possible November 1999 storm, only three teams had results that were correct for the time of the event, and only Lyytinen had both the time and the peak meteor rate correct to within the stated error bars.

The complete story of this prediction, the expedition, and its successful conclusion are beyond the scope of this paper, but may be found in the reference.^[xix]

With the documented track record the eph has now established, it is small wonder that professional astronomers are no longer willing to make wagers with eph proponents about the outcome of either recent or future eph predictions.

But sadly, research funding is still being poured almost exclusively into competitor theories.