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Across
  1. 4. Large group of galaxies that are gravitationally bound
  2. 6. Dwarf Remnant of a low to medium mass star
  3. 8. Planet Rocky planet with a solid surface
  4. 9. Dwarf Hypothetical stellar remnant that has cooled down to the point where it no longer emits light
Down
  1. 1. Theory Theory explaining the formation of the solar system from a giant cloud of gas and dust
  2. 2. Energy Hypothetical form of energy that is thought to permeate all of space and accelerate the expansion of the universe
  3. 3. Nebula Bright shell of gas ejected by a dying star
  4. 4. Evolution Process by which a star changes over its lifetime
  5. 5. Nebula Rotating disk of gas and dust from which the solar system formed
  6. 7. Matter Hypothetical form of matter that does not emit or interact with electromagnetic radiation