Stars and Black Holes Crossword

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Across
  1. 2. a celestial object, thought to be a rapidly rotating neutron star, that emits regular pulses of radio waves and other electromagnetic radiation
  2. 4. The study of the interaction between matter and electromagnetic radiation
  3. 7. the closest and most well-known yellow hypergiant
  4. 8. the elements that stars absorb
  5. 9. An astrophysical phenomenon that occurs when the crust of a neutron star undergoes a sudden shifting
  6. 11. an extremely rare, extraordinarily massive, dynamically unstable star with an enormous luminosity
  7. 14. a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure
  8. 18. any star of average or low luminosity, mass, and size
  9. 19. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  10. 20. the distance that light travels in one year
  11. 22. fixed luminous point in the night sky which is a large, remote incandescent body like the sun
  12. 23. the apparent change in the position of a star due to the motion of the Earth
  13. 24. the star around which the earth orbits
  14. 25. in between stellar-mass and supermassive
  15. 26. a powerful and luminous stellar explosion
  16. 27. 3 to 20 times the mass of our Sun
  17. 28. our galaxy
  18. 29. a region of space having a gravitational field so intense that no matter or radiation can escape
Down
  1. 1. an independent agency of the U.S. federal government responsible for the civilian space program
  2. 3. a very large star that is even brighter than a giant, often despite being relatively cool
  3. 5. a physical quantity that expresses hot and cold
  4. 6. the parallax of one arcsecond
  5. 10. the total amount of energy by a star, galaxy, or other astronomical object emitted per unit of time
  6. 12. The process by which a star changes during its lifetime
  7. 13. a star with substantially larger radius and luminosity than a main-sequence star of the same surface temperature
  8. 15. 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
  9. 16. an expert in or student of astronomy
  10. 17. powers a star for most of its life
  11. 21. measure of the brightness of a star or other celestial body
  12. 27. black holes with millions to billions of times the mass of our Sun