the big band

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Across
  1. 2. the simplest, lightest, and most abundant chemical element in the universe, represented by the symbol H and atomic number 1. It consists of one proton and one
  2. 4. the scientific study of everything in the universe beyond Earth's atmosphere, including stars, planets, moons, galaxies, and gas
  3. 5. an American astronomer who proved the universe is expanding and that galaxies exist outside our own Milky Way
  4. 10. American radio astronomer who co-discovered cosmic microwave background radiation, confirming the Big Bang theory
  5. 13. the faint, nearly uniform, remnant heat left over from the Big Bang, filling all space in the universe
  6. 16. a massive, gravity-bound system consisting of stars, stellar remnants, gas, dust, and dark matter
  7. 17. a colorless, odorless, tasteless, and non-toxic noble gas that is lighter than air
  8. 18. refinement of everyday thinking
Down
  1. 1. German-American radio astronomer and physicist
  2. 3. all elements heavier than helium were created inside stars, a process known as stellar nucleosynthesis.
  3. 6. the entire range of all types of light radiation, organized by wavelength or frequency
  4. 7. everything that exists, encompassing all space, time, matter, and energy
  5. 8. The narrow segment of electromagnetic radiation that the human eye can perceive, spanning colors from violet to red
  6. 9. The Big Bang theory is the leading scientific explanation for the origin of the universe
  7. 11. a scientific instrument that splits light (or other radiation) into its component colors/wavelengths—like a prism creating a rainbow—and records this spectrum
  8. 12. the capacity or ability to do work, cause change, or move matter
  9. 14. the stretching of light waves from an object (like a star or galaxy) as it moves away from an observer
  10. 15. the decrease in wavelength (and increase in frequency) of light emitted by an object as it moves toward an observer