The findings potentially solve the paradox of how liquid water seems to have persisted on Mars even when the climate grew too cold.

Earth and Mars in comparison. Mars has only about 10.7 percent of earth's mass but is roughly half its radius. Mars remains a true puzzle, but not for the reasons most people would think. Sure, ...

Mars has lost immense amounts of water over it lifetime, and scientists aren't sure exactly how. New research hints that the planet's violently varying tilt may be a key factor. When you purchase ...