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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.
3. long distance or great amount
4. a star showing a sudden large increase in brightness and then slowly returning to its original state over a few months.
6. the angular amount of parallax in a particular case, especially that of a star viewed from different points in the earth's orbit.
9. giant/ very large star of high luminosity and low surface temperature.
10. star/ In astronomy the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness

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. a group or cluster of related things
5. magnitude/the magnitude of a celestial object as it is actually measured from the earth.
7. magnitude/ the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs.
8. giant/ a very large star that is even brighter than a giant, often despite being relatively cool.