Solar system

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Across
  1. 2. The largest planet, its dark red spot is a storm larger than Earth.
  2. 3. It was a wet and warm planet billions of years ago.
  3. 4. It was the first planet discovered through mathematical calculations, rather than observation.
  4. 7. It has the brightest, most massive and most complex ring system of any planet.
Down
  1. 1. The hottest planet in our solar system.
  2. 3. The smallest and fastest planet, it zips around the Sun in only 88 Earth days.
  3. 5. The only planet in our solar system with liquid water on the surface.
  4. 6. It is tipped on its axis by almost 90-degrees.