science defs

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Across
  1. 3. a galaxy in which the stars and gas clouds are concentrated
  2. 5. the forse that causes objects with mass to attract one another
  3. 7. a state of matter with indefinite volume and shape
  4. 10. a star and the group of planets and other celestial bodies that are held by its gravitational attraction and revolved around it
  5. 11. Theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago
  6. 12. a spiral galaxy with a central bar shaped structure composed of stars
Down
  1. 1. type of radiation including visable light
  2. 2. a large grouping of stars in space
  3. 4. a unit of astromonical distance equivalent to the distance that light tracels in one year
  4. 6. a displacement of the spectrum of a celestial body toward longer wavelengths
  5. 8. tiny particles of matter floating in space
  6. 9. cloud of gas and dust in outerspace