Space

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Across
  1. 4. Sunlight is a mixture of visible light and this type of radiation.
  2. 5. Our planet travels around the Sun in this type of orbit
  3. 6. This happens when a massive star uses up the nuclear fuel in its core
  4. 9. A sphere of trillions of planetesimals (small rocky or icy bodies) that surround the solar system
  5. 10. He first stated that Earth was round and not flat
Down
  1. 1. The hottest plant in the solar system
  2. 2. The brightest star in the sky, visible from both hemispheres.
  3. 3. The point of no return around a black hole
  4. 7. It is the coldest temperature possible
  5. 8. The largest constellation