Astronomy Extra Credit

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Across
  1. 5. The collapsed core of a massive star
  2. 10. A compressed core of an exploded star made up almost entirely of neutrons
  3. 11. This is a variable star whose light pulsates in a regular cycle.
  4. 14. A star that fluctuates in brightness. These include eclipsing binaries.
  5. 16. cloud of dust in gas in space.
  6. 19. The point in the orbit of a planet or other celestial body where it is farthest from the Sun.
  7. 21. A spinning neutron star
  8. 24. A flow of charged particles that travels from the Sun out into the Solar System.
  9. 26. A grouping of stars that make an imaginary picture in the sky.
  10. 27. A disk of gas that accumulates around a center of gravitational attraction.
  11. 28. The point in the orbit of the Moon or other satellite where it is farthest from the Earth.
  12. 29. An imaginary sphere around the Earth on which the stars and planets appear to be positioned.
  13. 30. describes anything that contains mass
  14. 31. Dense regions of molecular clouds where stars are forming.
Down
  1. 1. A star that flares up to several times its original brightness for some time before returning to its original state.
  2. 2. A large grouping of stars.
  3. 3. A large distance often used in astronomy. A parsec is equal to 3.26 light-years.
  4. 4. The part of the Sun's atmosphere just above the surface.
  5. 6. The point in the orbit of a planet or other body where it is closest to the Sun.
  6. 7. A system of two stars that revolve around a common center of gravity.
  7. 8. This teacher is in your top 10 favorites from school.
  8. 9. A mutual physical force of nature that causes two bodies to attract each other
  9. 12. The invisible boundary around a black hole past which nothing can escape the gravitational pull - not even light.
  10. 13. The apparent change in position of two objects viewed from different locations.
  11. 15. A branch of science that deals with studying the origin, structure, and nature of the universe.
  12. 17. indicates that an object is moving toward the observer.
  13. 18. A theoretical shell of comets that is believed to exist at the outermost regions of our solar system
  14. 20. A term used to describe matter in the universe that cannot be seen
  15. 22. center of a black hole
  16. 23. The highest energy, shortest wavelength form of electromagnetic radiation.
  17. 25. Matter consisting of particles with charges opposite that of ordinary matter.