Astronomy Extra Credit

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