We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

Saturn stands stationary amid the stars of Pisces at 4 A.M. EDT. It is followed two hours later by asteroid 3 Juno, which reaches its stationary point in Libra at 6 A.M. EDT. Only Saturn is visible in ...