Chapter 12 Using the Electromagnetic Spectrum to Explore the Universe

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Across
  1. 3. (two words) A small, dense, cooling remnant of a low-mass star that has exhausted its fuel.
  2. 6. (two words) A type of electromagnetic radiation with wavelengths longer than visible light, often associated with heat.
  3. 8. An isotope of hydrogen with one proton and two neutrons, used in nuclear fusion.
  4. 10. The process by which two atomic nuclei combine to form a heavier nucleus, releasing energy.
  5. 11. A cloud of gas and dust in space, often the birthplace of stars.
  6. 14. The study of the interaction between matter and electromagnetic radiation; used to identify elements in stars.
  7. 15. A substance made of one type of atom; elements are formed in stars through nuclear fusion and other cosmic processes.
  8. 16. (two words) The dense remnant of a massive star after a supernova, composed almost entirely of neutrons.
  9. 18. The first and simplest element in the universe, and the primary fuel for stars.
  10. 20. (two words) A spectrum of light absorbed by atoms or molecules, showing dark lines that correspond to specific wavelengths.
Down
  1. 1. (two words) A chart that organizes all known elements by increasing atomic number and recurring chemical properties.
  2. 2. (two words) The highest-energy form of electromagnetic radiation, often released during nuclear fusion and supernovae.
  3. 4. (three words) A star that is fusing hydrogen into helium in its core; the longest and most stable period of a star's life.
  4. 5. (two words) An extremely dense object with a gravitational pull so strong that not even light can escape.
  5. 7. (two words) The full range of electromagnetic radiation, from radio waves to gamma rays.
  6. 9. A powerful stellar explosion that occurs when a massive star collapses, responsible for creating heavy elements.
  7. 12. The distance between two successive peaks of a wave; determines the type of electromagnetic radiation.
  8. 13. The number of wave cycles that pass a point in one second; inversely related to wavelength.
  9. 17. (two words) A late-stage star that has expanded and cooled after using up its hydrogen fuel.
  10. 19. An isotope of hydrogen with one proton and one neutron, involved in fusion reactions.