Intro to Astronomy Vocab

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Across
  1. 5. How bright a star looks from Earth.
  2. 8. A natural force that pulls objects toward each other.
  3. 9. The curved path of a celestial body around another body in space.
  4. 11. A push or a pull on an object.
  5. 12. A tiny, neutral particle with no charge in an atom's center.
  6. 15. A tiny, negative particle that spins around an atom's center.
  7. 16. The distance from Earth to the Sun, about 93 million miles.
Down
  1. 1. How bright a star actually is from a standard distance.
  2. 2. The visible part of the universe we can see from Earth.
  3. 3. The total amount of energy a star gives off per second.
  4. 4. A step-by-step way to test ideas and learn about the natural world.
  5. 6. A unit of distance used in astronomy, equal to about 3.26 light years.
  6. 7. Fusion The process where atomic nuclei combine to release huge amounts of energy.
  7. 10. A tiny, positive particle inside an atom's center.
  8. 13. The distance light travels in one Earth year.
  9. 14. The basic building block of all matter in the universe.