Back in the 1980s, NASA’s Voyager spacecraft made a brief flyby of Saturn’s moons, providing us with a tantalising glimpse of new worlds. Now, the Cassini mission has finished the job, providing us ...

Although not an official conjunction, three planets and the Moon are grouped within about 10 degrees of the Sun today. Except for the Moon, which will move on into the evening sky, the planets will be ...

How far it is from the sun: 886 million miles (1.4 billion kilometers), on average How big it is: 72,400 miles (116,500 km) across, or almost 10 times the size of Earth. How many moons it has: At ...

Far from the warmth of the Sun, some of the coldest-looking worlds in the solar system may be hiding the hottest surprises. New modeling work suggests that several icy moons of Saturn and Uranus could ...