If I were on Mars, how often would I see Earth transit the Sun? Steven RiserConyers, Georgia From Mars, Earth transits the ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's illustration of what a terraformed Martian landscape might look like. Mark Stevenson/Stocktrek Images via Getty Images ...

Mars didn’t always look like the barren world we see today. Over billions of years, the Sun’s solar wind stripped away much of its atmosphere, helping transform it from a warmer, wetter planet into a ...

Tests conducted with tardigrades suggest that there is something in Martian dirt that dramatically reduces biological ...

Chalk up another victory for “Conan the Bacterium”—a rugged germ that fresh research suggests could conquer the solar system.

A new study shows how simulated Mars dust affects tardigrades, offering insight into space farming and contamination risks.

When I was in middle school, my biology teacher showed our class the sci-fi movie Star Trek III: The Search for Spock. The plot drew me in with its depiction of the “Genesis Project”—a new technology ...

A new laboratory experiment is adding weight to one of science’s strangest possibilities: that life may travel between planets. Researchers have been testing whether microscopic organisms could ...

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 used to have a warmer and wetter climate, which changed after billions of years because the Sun's solar wind removed ...

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 ...