  Since 990 is divisible by ten, the answer is 990. If you were rounding off 994 the answer would also be 990. If you were rounding off 995, the answer would be 1,000.
Jupiter is the largest and most massive planet in the solar system. It was named after the chief Roman god. It is a gas giant composed of liquid and gaseous matter, and has many moons. Some of the storms in its atmosphere have lasted hundreds of years.
The temperature in Jupiter's upper atmosphere is around -145C (-230F). Deeper below the clouds the temperate reaches 21C (70F). Near the planet's center the temperature is around six times hotter than the surface of the Sun! Jupiter has 62 moons, 16 of which have a diameter of at least 6 miles.The four main moons of Jupiter are Io, Europa, Ganymede and Callisto, all discovered in 1610 by Galileo and referred to as the Galilean Moons. The gas giant is the largest planet in the solar system with a diameter of around 89,000 miles (143,000 km). 2  Jupiter is 11 times larger than Earth in diameter and around 10% as large as the sun.