Astronomy!

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Across
  1. 4. Algol variables are which type of stars?
  2. 5. The J0540-6919 is a type of ______.
  3. 6. The center of this nebula is home to four massive, young stars.
  4. 8. A list of over 13,000 deep-sky celestial objects.
  5. 9. Explosion that occurs in binary systems in which one of the stars is a white dwarf.
  6. 10. Variable stars whose brightness varies irregularly and are often protostars on the Hayashi track.
  7. 11. 100-400 nm.
Down
  1. 1. The total energy is proportional to the fourth power of its temperature.
  2. 2. 1.4 times the mass of the Sun is known as what?
  3. 3. A set of discrete bright bands that are emitted based on the chemicals which are emitting the photons.
  4. 5. The sun is powered by this atomic reaction.
  5. 7. Galaxies with no rotational symmetry.