There are good reasons to think that Earth and Mars originally formed a single planet outside the orbit of Jupiter. Early in Solar System history, Jupiter’s powerful gravitational field pulled this planet past the gas giant. As the planet neared Jupiter, tidal friction heated it to the melting point, and Jupiter tore Mars away from Earth, leaving the Pacific Basin and an array of evidence on both planets. Earth and Mars then sped off into the inner solar system.
How Do We Know This?
Tags: Earth, earth science, geomagnetism, Hawaiian Islands, hotspots, Mars, moon, Pacific, planetary science, plate tectonics, plumes, seismography, volcanism
Once a leading theory of the origin of the Earth-Moon system, the Capture Theory is simple and intuitively plausible. The numerous instances of moons with retrograde orbits show that capture is fairly common. The lunar orbit’s three moments of inertia are consistent with a past very eccentric orbit, suggestive of capture. However, the Moon would have to come from a different part of the solar system to account for its very depleted iron compared to the Earth’s iron, which means that it would approach the Earth at a high velocity that would prevent capture. Researchers have searched in vain for a braking mechanism that would slow it down so it could be captured. Still, the accumulated evidence and arguments make the Capture Theory a viable one.
But
Tags: Capture theory, Earth, earth science, Earth-Moon system, Giant Impact, Jupiter, Mars, Mercury, moon, origin of Earth, origin of Mars, origin of the Moon, Outer Solar System Origin of the Terrestrial Planets, oxygen isotope ratios, planetary science
There’s no shortage of candidates for the cause of the mass extinctions of prehistory. But experts have found flaws in every one.
Asteroid impact at Chicxulub, Yucatan clearly played a role in the Cretaceous-Paleogene (K-Pg) extinction that wiped out the non-flying dinosaurs 66,000,000 years ago, though scientists point to the serious disruptions that had begun hundreds of thousands of years before with the basalt flows of the Deccan Traps. Giant basalt lava flows that poisoned the atmosphere and oceans played a role in four or perhaps all five major extinctions. But other enormous basalt flows have not caused extinctions, nor did they cause the tsunamis associated with various extinctions. Researchers have suggested many other mechanisms, but there’s no consensus at all.
Lurking in the background, however, is a quite plausible cause, one that would have possessed the power to set off the volcanic activity, air pollution, mass wasting, sea level shifts, loss of oxygen in oceans, climate changes, and other phenomena associated with the extinctions.
The Martian Theory
Tags: catastrophe, Chicxulub, climate change, Deccan Traps, dinosaurs, earth science, extinctions, geology, great mass extinctions, Mars, paleontology, planetary science, prehistory, tsunamis, Valles Marineris
If we can interpret ancient myths correctly, they could lead us to more accurate and penetrating views of the history of the solar system. They might teach us about the forces at work and explain anomalies bequeathed to us by a long-hidden past. But how can we interpret these myths, the products of minds so far removed from ours? How do we know which interpretation is correct, if any? Are we doomed to speculate without ever achieving certainty?
Here we will interpret two Bronze Age myths to illustrate the high scientific value such myths might contain. We will also see how easy it can be to understand a myth once the right interpretation becomes available.
Tags: Ancient China, Ancient Greece, Bronze Age catastrophes, comets, earth science, history of solar system, interpretation of myths, Jupiter, myths, philosophy of science, planetary science, Velikovsky, venus, Zeus
In his Worlds in Collision (New York: Macmillan, 1950), Immanuel Velikovsky argued that Venus emerged as a red-hot comet from Jupiter and passed Earth every 52 years, causing the Bronze Age catastrophes, before settling into its current orbit. His claim set off a controversy in which his theory was rejected and stigmatized. But over the years, new findings have changed the picture. Here are eight new reasons to accept a Revised Venus Theory.
Tags: Archer Yi, Athena, Bronze Age catastrophes, catastrophism, earth science, Immanuel Velikovsky, interpretation of myths, Martian Theory of Mass Extinctions, Metis, Outer Solar System Origin of the Terrestrial Planets, planetary science, Poseidon, Revised Venus Theory, The Knowable Past, Theory of the Reversing Earth, tidal theory of the planets, Worlds in Collision