Space Exploration

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Across
  1. 3. The condition in which people or objects appear to be weightless in space. (12 letters)
  2. 4. A massive system of stars, planets, gas, and dust held together by gravity. (6 letters)
  3. 6. The curved path of an object around a star, planet, or moon. (5 letters)
  4. 8. The scientific study of celestial bodies and the universe. (9 letters)
  5. 9. Energy emitted as waves or particles, found in space as cosmic radiation. (9 letters)
Down
  1. 1. The minimum speed needed for an object to break free from a planet’s gravitational pull. (14 letters)
  2. 2. Related to the sky or outer space, including stars and planets. (8 letters)
  3. 5. A person trained to travel and work in space. (9 letters)
  4. 7. The force that attracts objects toward one another, keeping planets in orbit around stars. (6 letters)