Cells

Edit Answers
123456789101112
Across
  1. 4. unit (AU): the mean distance from the center of the Earth to the center of the sun used to measure distances in the solar system
  2. 6. dioxide: a gas in the air made of carbon and oxygen atoms. The atmosphere of Venus is made of carbon dioxide, which traps heat
  3. 7. an imaginary line that an object spins or revolves around
  4. 9. an instrument used to make objects in space look bigger
  5. 11. Belt: an asteroid belt in the solar system beyond the planets where many small, icy bodies are located
  6. 12. a force that exists between any two objects that have mass. Holds planets in their orbits
Down
  1. 1. hypothesis: the theory that a solar system evolves from a hot gaseous nebula
  2. 2. system: a system of objects that revolve around a star
  3. 3. everything that exists in, on and around the Earth
  4. 5. a brief streak of light in the sky that is a piece of rock or metal from space that strikes Earth's surface
  5. 7. layers of gas that surround a planet
  6. 8. flares: large solar eruptions that occur near sunspots
  7. 10. the circular path of an object as it revolves around another object