PLANETS | Level 7.5/10

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