planets

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Across
  1. 2. It is a gas giant, with an average radius of about 9 times that of Earth. It has an eighth of the average density of Earth,
  2. 3. At least 97 moons orbit the planet; the four largest moons—Io, Europa, Ganymede, and Callisto—orbit within the magnetosphere
  3. 5. It is often called Earth's "twin" or "sister" among the planets of the Solar System for its orbit being the closest to Earth's
  4. 7. the smallest in the Solar System. It is a rocky planet with a trace atmosphere and a surface gravity
Down
  1. 1. It is 17 times the mass of Earth.
  2. 4. made of water, ammonia, and methane in a supercritical phase of matter
  3. 6. third planet from the sun
  4. 7. desert like