Solar system · Planet
Planet
Jupiter
The king of the planets: more than twice the mass of all the others combined, with four moons you can see in binoculars.
Discovery
Galileo found the four big moons in January 1610 — the first things seen to orbit something other than the Earth.
Look for
Hold binoculars steady and look for up to four tiny points in a line beside it. They change places from night to night.