Astronomy Crossword Puzzle

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