Astronomy Part 2 Vocabulary

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Across
  1. 1. the type of magnitude describing how bright a star would be if it was 10 parsecs away
  2. 4. the four inner planets
  3. 7. the visible surface of the Sun
  4. 10. the acronym defining the order of star classifications
  5. 12. occurs when the Moon passes through the Earth's shadow
  6. 14. the apparent backward motion of a planet
  7. 15. the trapping of the sun's warmth in a planet's lower atmosphere
  8. 17. the type of galaxy that describes our Milky Way
  9. 18. the gas responsible for the blue color of Uranus and Neptune
  10. 19. the region that 90 percent of stars occupy on the HR diagram
  11. 20. the element that makes up 70 percent of the Sun's composition
Down
  1. 2. occurs when the Moon passes directly between the Sun and the Earth
  2. 3. the massive explosion that occurs when the outer layers of a star explode
  3. 5. the type of magnitude describing how bright a star appears
  4. 6. an oval shape describing a planet's orbit
  5. 8. the graph charting stellar luminosity, temperature, and absolute magnitude
  6. 9. the small extremely dense object with immense gravity
  7. 11. the four outer planets, also called Jovian planets
  8. 13. the star cloud where stars are born
  9. 16. the type of spectrum produced by noncompressed gas containing bright lines