This great blue-green ball.
We live on it, and it sustains us: The Earth. It's impressive and inspiring - and not without threats.
At the rate the Americans send satellites into space, you'd be right to ask, is it special anymore? Not very. But the Sentinel-2B satellite launch next week is. It's a "breakthrough" in European technology.
The discovery of seven new Earth-like planets has risen hope to find extraterrestrial life. During space explorations, though, researchers have to be careful to avoid contaminating other worlds with life from Earth.
Microfossils found in Canada may be the oldest-known evidence of life on Earth, scientists have announced. The discovery supports theories about how life began, though some say the evidence may not be strong enough.