review

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Across
  1. 4. a kind of cluster with newly formed stars
  2. 6. distribution light arranged in a progressive series according to wavelength
  3. 8. the champion telescope of distance measurements
  4. 11. location of the JWST
  5. 12. how much energy a star emits
  6. 14. the kind of nebula formed at the end of the life of a low-mass star
  7. 15. the ability of a telescope to tell close objects apart
  8. 17. what the Vera Rubin telescope will be great at detecting
  9. 19. a very small angle
  10. 20. what astronomers put in telescopes to take images in specific colors
  11. 21. something present in star-forming regions besides gas and stars
Down
  1. 1. the kind of telescope most used by professional astronomers
  2. 2. how much light we detect from a star
  3. 3. a kind of luminous variable star used as a standard candle
  4. 5. apparent shift on the sky of a star as the Earth orbits the Sun
  5. 7. the property of a star that tell us its temperature
  6. 8. a kind a cluster with many old stars tightly packed
  7. 9. what prevents X-rays from reaching the surface of Earth
  8. 10. what main sequence stars fuse in their core
  9. 13. a ranking of brightness or luminosity
  10. 16. light with wavelength slightly larger than red light's
  11. 18. the Milky Way is one