  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.
by Fraser Cain on December 22, 2008. Itâs hard to explain what the atmosphere of jupiter is, since the planet is 90% hydrogen and 10% helium. Here on Earth, weâd consider those gasses all atmosphere.But under its strong gravity, Jupiter pulls together this atmosphere into separate layers with very interesting properties.y Fraser Cain on December 22, 2008. Itâs hard to explain what the atmosphere of jupiter is, since the planet is 90% hydrogen and 10% helium. Here on Earth, weâd consider those gasses all atmosphere.