Aside from exposure to elevated radiation levels, Martian gravity is about 38 percent of Earth's. This has the potential to ...

If I were on Mars, how often would I see Earth transit the Sun? Steven RiserConyers, Georgia From Mars, Earth transits the Sun four times in a 284-year cycle. The transits occur in either May or ...

Small but mighty, the red planet — our celestial neighbor — has made Earth’s climate what it is today. Mars’ gravitational pull serves as a stabilizing force for our home’s orbit, tilt and position ...

Mars is half the size of Earth, with one-tenth of our planet’s mass, and at the nearest point in its orbit is over 33 million miles away. Yet new research highlights the extraordinary influence the ...

A seemingly small planetary neighbor may play a larger role in Earth’s climate than previously thought. Mars is only about ...

Mars is known for its barren desert landscape and dry climate. But two recent studies in the journals Nature and Science go beneath the surface,... The core of Mars looks like Earth’s. What makes the ...

Mars didn’t always look like the barren world we see today. Over billions of years, the Sun’s solar wind stripped away much ...

NASA’s twin ESCAPADE spacecraft will uncover how the Sun stripped Mars of its atmosphere. Mars is a very different world ...

A NASA rover has discovered signs of an ancient river beneath Mars' surface, using ground-penetrating radar to reveal buried ...

For anyone curious about what it's like to stand on another planet, Earth offers a few convincing previews. Mars may be 140 million miles away, but scientists and movie directors have been finding its ...

Add Yahoo as a preferred source to see more of our stories on Google. From Mars, Earth transits the Sun four times in a 284-year cycle. The transits occur in either May or November at intervals of 100 ...