  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.
Â© NASA. Jupiter is by far one of the most popular planets in the solar system aside from the earth because of its size. It is the largest planet in the solar system with a diameter of 142,984 km at its equator and it is the fifth planet from the Sun. Jupiter has a mass one-thousandth that of the mass of the Sun.omposition of Jupiter. Â© NASA. Jupiter has the largest planetary atmosphere in the Solar System with an altitude of 5,000 km. Since the planet has no well-defined solid surface, the boundary of the atmosphere and the planetâs surface is known when the pressure is equal to 10 times the surface pressure of the earth.