astronomy

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Across
  1. 2. an enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars
  2. 4. all distances in the universe are stretching out at the same rate
  3. 5. a small rocky body orbiting the sun
  4. 8. light
  5. 10. average star
  6. 12. shows the relationship between a star's temperature and its luminosity
  7. 14. the magnitude of a celestial object as it is actually measured from the earth
  8. 17. the changes in frequency of any kind of sound or light wave
Down
  1. 1. the range of all types of EM radiation
  2. 3. the magnitude (brightness) of a celestial object
  3. 6. ball of gas and fire
  4. 7. snowballs orbiting the sun
  5. 9. the colossal explosion of a star
  6. 11. all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy
  7. 13. any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave
  8. 15. the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum
  9. 16. a huge collection of gas, dust, and billions of stars and their solar systems