Mars looks lopsided on the surface — mountains in the south, flat plains in the north. New research shows the asymmetry runs all the way to its molten heart.

The rover's laser found large carbon molecules sitting in ancient riverbed rock. What made them, biology or chemistry, is exactly what no one can yet say.

The Aeolus orbiter would map Mars's atmosphere daily, but it rides on a rocket Relativity has not yet flown to orbit.