  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 hydrogen in Jupiter's atmosphere exists in highly exotic states at deep levels of the atmosphere. According to Space.com, at depth, the Jovian atmosphere becomes an ocean of liquid metallic hydrogen. This is the point at which the gas pressure is equal to 1 bar, or the air pressure felt on Earth at sea level.