Out of this world.
These planets are the size of Earth, could have water...and maybe even life.
Getting to Venus is tricky, as it so happens.
Life on Earth can tell us a lot about life on Mars!
Does this mean an alien invasion is near?
A new study shows that one of Saturn's moons could create life.
Every 27 million years, the Earth's population is drastically reduced. Could Planet X offer the explanation?
In space, no one can hear you scream... these awesome facts!