  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.
JUPITERâS ATMOSPHERE IS MOSTLY HYDROGEN AND HELIUM, WHICH ARE THE LIGHTEST AND MOST ABUNDANT GASES IN THE UNIVERSE. The weather on Earth is mainly driven by heat from the sun. But the sunlight on Jupiter is 25 times weaker than that on Earth, yet its winds are three to four times stronger. In some places, the wind whips through the atmosphere at 575 kilometers (360 miles) per hour.