  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.
Jupiter's mantle is made up of liquid hydrogen and â¦ helium. Jupiter's cloud tops are made up of hydrogen and helium. Jupiter's atmosphere is made up of 89.8% hydrogen and 10.2% helium with a little bit of methane and ammonia.