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Across
  1. 2. variable/ a variable star having a regular cycle of brightness with a frequency related to its luminosity, so allowing estimation of its distance from the earth.
  2. 3. long distance or great amount
  3. 4. a star showing a sudden large increase in brightness and then slowly returning to its original state over a few months.
  4. 6. the angular amount of parallax in a particular case, especially that of a star viewed from different points in the earth's orbit.
  5. 9. giant/ very large star of high luminosity and low surface temperature.
  6. 10. star/ In astronomy the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness
Down
  1. 1. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
  2. 2. a group or cluster of related things
  3. 5. magnitude/the magnitude of a celestial object as it is actually measured from the earth.
  4. 7. magnitude/ the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs.
  5. 8. giant/ a very large star that is even brighter than a giant, often despite being relatively cool.