Astronomy Crossword Puzzle

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Across
  1. 2. A rotating neutron star emitting beams of radiation at regular intervals. (PULSAR)
  2. 4. Flattened circle orbit shape (Ellipse).
  3. 7. Variable stars with a well-defined relation between their luminosity and period. (CEPHEIDS)
  4. 8. A telescope that uses mirrors to gather and focus light. (REFLECTOR)
  5. 9. A planet orbiting a star outside our solar system. (EXOPLANET)
  6. 11. An extremely luminous active galactic nucleus with a supermassive black hole. (QUASAR)
  7. 13. The region around Earth dominated by its magnetic field. (MAGNETOSPHERE)
  8. 16. A group of stars forming a recognizable pattern. (CONSTELLATION)
Down
  1. 1. A developing star not yet hot enough for nuclear fusion. (PROTOSTAR)
  2. 3. A large group of smaller galaxy clusters or galaxy groups. (SUPERCLUSTER)
  3. 5. A measure of an orbit's deviation from a perfect circle. (ECCENTRICITY)
  4. 6. A large, cool star in the late stage of stellar evolution. (RED GIANT)
  5. 10. A temporary dark area on the Sun's surface caused by magnetic activity. (SUNSPOT)
  6. 12. The four largest moons of Jupiter discovered by Galileo. (GALILEAN)
  7. 14. Study of separated light (Spectroscopy).
  8. 15. A method of measuring distances to nearby stars by observing their apparent shift. (PARALLAX)