A Giant Impact Solving the Mystery of How Mars' Moons Formed (+Video)
A Giant Impact Solving the Mystery of How Mars’ Moons Formed
Where did the two natural satellites of Mars, Phobos and Deimos, come from?
For a long time, their shape suggested that they were asteroids captured by Mars. However, the shape and course of their orbits contradict this hypothesis. The origin of the two Martian moons, Phobos and Deimos, remained a mystery.
Due to their small size and irregular shape, they strongly resembled asteroids, but no one understood how Mars could have ” captured ” them and made them into satellites with almost circular and equatorial orbits.
According to a competing theory, toward the end of its formation Mars suffered a giant collision with a protoplanet: but why did the debris from such an impact create two small satellites instead of one enormous moon, like the Earth’s?
Two independent studies have now solved the puzzle: the Martian moons must have arised from a giant collision.
Phys.Org – News and Articles on Science and Technology
Read more here: http://tinyurl.com/h9zqbgz
Images credit: Antony Trinh / Royal Observatory of Belgium &
Université Paris Diderot / Labex UnivEarthS
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