Could it hold the key to life? A space probe has returned from a seven-year journey into the solar system. Scientists hope it might be carrying our very earliest ancestors.
Yes, this really DID land from outer space
Ancient: This tiny capsule is carrying dust and rock that is 4.5 billion years old. Glossary
Asteroid - A small body in space, made of metal and rock material. Asteroids usually orbit the sun, but if knocked off course they can be drawn into Earth’s gravity and fall towards it.
Utah - A mountainous state in the west of the USA. More than half its inhabitants are Mormons, who founded its capital, Salt Lake City.
Solar System - The Sun and the objects whose movement it controls.
Nasa - The National Aeronautics and Space Administration, responsible for the US space programme.
Pessimism - Always expecting the worst.