How the Red Planet acquired its two moons, Phobos and Deimos, is unknown – they could have formed after something collided with the planet, or started out as asteroids – but now there is a hint of a cometary origin...
Become a member to take advantage of more features, like commenting and voting.
Register or sign in today!
Become a member to take advantage of more features, like commenting and voting.
Register or sign in today!