The Big Bang Theory

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Across
  1. 2. the lightest, simplest, and most abundant element in the universe, composed of one proton and one electron
  2. 4. the scientific study of everything outside Earth's atmosphere, including stars, planets, moons, galaxies, and space phenomena
  3. 5. proving other galaxies exist outside the Milky Way and discovering that the universe is expanding
  4. 10. He is most famous for the "discovery of the century" in cosmology. In 1964, while working at Bell Labs, he and Arno Penzias discovered Cosmic Microwave Background (CMB) radiation.
  5. 13. the faint, leftover light and heat from the Big Bang, filling all of space uniformly
  6. 16. a massive, gravity-bound system containing millions to trillions of stars, gas, dust, and dark matter, all orbiting a common center
  7. 17. a colorless, odorless, tasteless, and non-toxic noble gas that is lighter than air and extremely unreactive
  8. 18. the pursuit of fundamental, elegant theories that reduce complex phenomena to their most basic, essential elements without losing accuracy
Down
  1. 1. a Nobel Prize-winning physicist known for his discovery of the "afterglow" of the Big Bang
  2. 3. refers to the development of stellar nucleosynthesis—the concept that all heavy elements in the universe are created inside stars through nuclear fusion
  3. 6. the entire range of all types of light radiation, arranged by energy, frequency, or wavelength
  4. 7. the totality of all existence, encompassing all space, time, matter, and energy
  5. 8. the narrow range of electromagnetic radiation that the human eye can perceive, spanning colors from violet to red
  6. 9. the leading scientific explanation for how the universe began 13.8 billion years ago from an extremely hot, dense point (singularity
  7. 11. a scientific instrument that breaks light (or other waves) into a spectrum—like a rainbow—and records it
  8. 12. the capacity or ability to do work, cause change, or move matter
  9. 14. the stretching of light waves from an object moving away from an observer, shifting its color toward the red end of the spectrum
  10. 15. a phenomenon where light from an object moving toward an observer shifts toward shorter, blue wavelengths