Once people get there, Mars will be contaminated with Earth life.
NASA/Pat Rawlings, SAIC
NASA's InSight Mars lander touches down Nov. 26, part of a careful robotic approach to exploring the red planet. But human exploration of Mars will inevitably introduce Earth life. Are you OK with that?
Following NASA's latest discovery of organic matter on the red planet, new findings in a salt lake in California could point to where to look for alien life.
Olympus Mons, biggest volcano in the Solar System.
They erupted for billions of years and make Earth's volcanoes look like molehills. Here's what we know and what we don't know about them.
A beautiful day on Pluto with clear blue skies.
This week, NASA has discovered great similarities between the Earth and Mars and Pluto. But when it comes to the potential for life, Mars is an increasingly hot favourite.
This digital false-colour image shows the dark, narrow streaks on Martian slopes inferred to be formed by seasonal flow of water on the planet. The streaks are roughly the length of a football field.
Image Credit: NASA/JPL-Caltech/Univ. of Arizona
Now that we have discovered liquid water on the surface of Mars, what does this mean for the prospects of finding life there, past or present?
Everything in space is so far away, but probes bring us closer.
Ain’t half hot: but where’s it heading?
Astrophysicists found out after the January 2014 solar flare that their predictions of solar weather were not very accurate. Here's the fix (kind of).