The Big Bang Theory

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Across
  1. 2. A chemical element that is the simplest and lightest of all chemical elements and is normally found alone as a colorless odorless highly flammable gas having two atoms per molecule
  2. 4. The scientific study of celestial objects, space, and the physical universe beyond Earth's atmosphere
  3. 5. An American astronomer who fundamentally transformed cosmology by proving that "nebulae" were actually separate galaxies beyond the Milky Way and establishing that the universe is expanding
  4. 10. (born 1936), the American radio astronomer who shared the 1978 Nobel Prize in Physics for co-discovering the Cosmic Microwave Background (CMB) radiation, providing crucial evidence for the Big Bang theory, or Robert R. Wilson (1914–2000), the physicist who designed Fermilab and proposed using proton beams for cancer therapy
  5. 13. Electromagnetic radiation—the cooled, relic "afterglow" of the Big Bang—that fills the entire universe, present from all directions
  6. 16. A massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter
  7. 17. A colorless, odorless, tasteless, and non-toxic noble gas with atomic number 2
  8. 18. A German-born theoretical physicist
Down
  1. 1. Cosmic Microwave Background (CMB) radiation
  2. 3. Prominent British astrophysicist and cosmologist
  3. 6. The entire range of all possible frequencies, wavelengths, and photon energies of electromagnetic radiation, extending from low-energy radio waves to high-energy gamma rays
  4. 7. Includes all of space, and all the matter and energy that space contains
  5. 8. The narrow segment of the electromagnetic spectrum ranging from roughly 380 to 750 nanometers (nm) that the human eye can detect, creating color perception
  6. 9. The prevailing cosmological model explaining that the universe began approximately 13.8 billion years ago from an extremely hot, dense singularity
  7. 11. A scientific instrument that splits electromagnetic radiation (light) into its component wavelengths (a spectrum) and records this data simultaneously using a multi-channel detector, such as a camera or CCD
  8. 12. The capacity to do work, cause change, or move matter, measured in joules
  9. 14. The phenomenon where light (or other electromagnetic radiation) from an object is stretched to longer, redder wavelengths because the source is moving away from the observer or because space itself is expanding
  10. 15. A scientific phenomenon where electromagnetic radiation (light) from an object decreases in wavelength, shifting towards the blue end of the spectrum, as the object approaches the observer