space learning crossword

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Across
  1. 2. a place in space where gravity pulls so much that even light cannot get out
  2. 4. an explosion of a star
  3. 5. newtons first law, an object in motion stays in motion, and object at rest remains at rest
  4. 7. a dimensionless quantity representing the amount of matter in a particle or object
  5. 9. graph in which the absolute magnitude of stars are plotted against their spectral types
  6. 12. the brightest star in the sky after the sun, lying in the constellation Canis major
  7. 15. the force by which a planet or another body draws objects towards it
  8. 17. how bright an object appears in the sky from earth
  9. 19. two stars orbit around a common center of mass
  10. 21. large object made of dust and ice that obit the sun
  11. 22. a group of stars that appear to form a picture or pattern
  12. 23. typically has a rotating disk with spiral 'arms' that curve out from a dense central region
  13. 24. any of a class of extremely dense, compact stars thought to be composed primarily of neutrons
Down
  1. 1. the complete range of all types of radiation that has both electric and magnetic fields that travel in waves
  2. 3. a supermassive black hole feeding on gas at the center of a distant galaxy
  3. 6. the difference in direction of a celestial object as seen by an abserver from two widely seperated points
  4. 8. the stellar core left behind after a dying star has exhausted its nuclear fuel and expelled its outer layers to form a planetary nebula
  5. 10. the apparent magnitude and object would have if it were located at a distance of 10 parsecs
  6. 11. rocky, airless remnants from the early formation of our solar system
  7. 12. a spinning, swirling disk of material
  8. 13. forms after a star has run out of hydrogen fuel for nuclear fusion,it has begun the process of dying
  9. 14. rotating neutron stars observed to have pulses of radiation at very regular intervals that typically range from milliseconds to second
  10. 16. a cloud of gas and dust in space believed to develop into a star
  11. 18. rocky objects in space that range in size from dust grains to small asteroids
  12. 20. when two nuclei combine to form a new nucleus