How many moons does Venus have?

There are dozens upon dozens of moons in the Solar System, ranging from airless worlds like Earth's Moon to those with an atmosphere (most notably, Saturn's Titan). Jupiter and Saturn have many moons each, and even Mars has ...

How many moons does Mercury have? (Update)

Virtually every planet in the solar system has moons. Earth has the moon, Mars has Phobos and Deimos, and Jupiter and Saturn have 67 and 62 officially named moons, respectively. Heck, even the recently-demoted dwarf planet ...

Jupiter's moon Ganymede

In 1610, Galileo Galilei looked up at the night sky through a telescope of his own design. Spotting Jupiter, he noted the presence of several "luminous objects" surrounding it, which he initially took for stars. In time, ...

Origins of Uranus' oddities explained by Japanese astronomers

The ice giant Uranus' unusual attributes have long puzzled scientists. All of the planets in the solar system revolve around the sun in the same direction and in the same plane, which astronomers believe is a vestige of how ...

What we know about Jupiter

Look towards the north-west after sunset (south-west in the northern hemisphere) and there is currently one bright point of light that easily stands out relative to everything around it. That is the planet Jupiter, shining ...

After the Moon, people on Mars by 2033... or 2060

On December 11, 2017, US President Donald Trump signed a directive ordering NASA to prepare to return astronauts to the Moon "followed by human missions to Mars and other destinations."

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