Mars is probably smaller than you think. It's just half the size of Earth, with barely a third of its mass. Even the Martian ...

Data from NASA's Mars Reconnaissance Orbiter, together with ground-based measurements from NASA Mars rovers Curiosity, Pathfinder and Opportunity, also helped make the case for ferrihydrite.

In fact, previous studies have claimed that even a tiny shift in Jupiter’s orbit could have bizarre effects on Earth. But what if we put an entire planet between Jupiter and Mars? According to ...

NASA’s revised plan for the MSR mission maintains its partnership with the European Space Agency, the primary contribution of which is a spacecraft to retrieve the samples from Mars orbit and ...

Our closest neighbors, Mars and Venus ... us keep our calendars aligned with Earth's orbit around the sun. Without them, our calendar would slowly drift out of sync with the seasons.