Earth Space Science

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Across
  1. 5. fusion The process by which two or more small nuclei fuse to make a bigger nucleus
  2. 6. A developing planetary body that grows by the accumulation of matter/material
  3. 7. Collision of asteroids on planets in the early solar system
  4. 8. system sun, planets, and all the other objects that revolve around the sun
  5. 9. the earliest stage of a star's life
Down
  1. 1. A gigantic explosion in which a massive star collapses and throws its outer layers into space
  2. 2. a cloud of gas and dust in space
  3. 3. compression A process by which the gravity of an object compresses it, reducing the size and increasing density.
  4. 4. Disk spinning mass of gas and dust from which stars and planets form