The story of how water got inside the moon could also help us understand the origin of water on Earth.
Asteroids have caused 26 nuclear-size explosions in the Earth’s atmosphere between 2000 and 2013, according to a new report by the B612 Foundation.
When schoolchildren conjure up an image of Saturn, it is the rings that make it stand out, but Jupiter, Uranus, and Neptune have also been observed to be surrounded by rings. New observations of a distant asteroid orbiting beyond Saturn, however, have shown that this too is surrounded by two fine, dense rings.
NASA is looking for help from the general public in creating algorithms to identify asteroids that may be in orbits that could bring them into collision with the Earth.
A recently discovered asteroid measuring about 30m across is expected to come within 217,000 miles (350,000km) of Earth tonight, passing between the Earth and the Moon.