Space

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Across
  1. 4. An explosion so violent that the dying star becomes more brilliant than an entire galaxy.
  2. 6. giants Very bright stars at the upper right of the H-R diagram.
  3. 7. lines A set of dark lines that show where light has been absorbed.
  4. 8. A spinning neutron star that appears to give off strong pulses of radio waves.
  5. 10. An object whose surface gravity is so great that even electromagnetic waves, at the speed of light, can't escape it.
  6. 12. A large cloud of gas and dust spread out over a large volume of space.
Down
  1. 1. dwarf Below the main sequence in the lower part of the H-R diagram.
  2. 2. A star system with two stars.
  3. 3. Found just below the super giants in the H-R diagram.
  4. 5. The innermost layer of the sun's atmosphere.
  5. 9. The outermost layer of the sun's atmosphere.
  6. 11. How bright a star really is.