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Earth's greatest spinoff
The giant-impact model suggests that, in the Earth's early history, the proto-Earth and Theia (a Mars-sized planet) collided and reformed as one body. A small part of the new mass spun off to become the Moon.
Some suggest that early Earth and Theia came from the same neighbourhood as the solar system was forming and were made of similar materials.
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Theories on how the Moon formed
Before the Apollo mission research, there were three theories about how the Moon formed.
- Capture theory suggests that the Moon was a wandering body that was captured by Earth's gravity as it passed nearby.
- Accretion the...
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Apollo mission evidence
The Apollo mission brought back rock and soil from the Moon. It showed that the Earth and Moon share chemical and isotopic similarities, suggesting a linked history.
The minerals on the Moon contain less water than similar terrestrial rocks. The Moon has material that form...
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Lunar landscapes
If you look at the lunar surface, it seems pale grey with dark splodges.
The pale grey is a rock named anorthosite. It forms as molten rock cools down. The dark areas are another rock type called basalt. Basalt is the most common surface on all inner plane...
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Theories on how the Moon formed
Before the Apollo mission research, there were three theories about how the Moon formed.
- Capture theory suggests that the Moon was a wandering body that was captured by Earth's gravity as it passed nearby.
- Accretion the...
Large Impact Theory
The Large Impact Theory brings upon the idea that Mars has suffered a large collision. Just like how the Earth's moon is the result of an immpact between our infant planet and a planetisimal named Theia.
With this theory, astronomers suggest that the composition of Phobos and Deimos may hav...
Surface
The red planet is actually many colors. At the surface, we see colors as brown, gold, and tan. The reason Mars looks reddish is due to oxidization—or rusting—of iron in the rocks, regolith (Martian “soil”), and dust of Mars. This dust gets kicked up into the atmosphere and from a distance makes t...
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