big bang teory

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Across
  1. 3. the strength and vitality required for sustained physical or mental activity.
  2. 6. a pioneering American astronomer who proved the existence of galaxies outside the Milky Way, establishing that the universe is expanding.
  3. 8. influential American avant-garde stage director, playwright, and visual artist
  4. 10. German-born theoretical physicist widely recognized as one of the most influential scientists in history.
  5. 11. prominent British astrophysicist and cosmologist
  6. 13. an instrument that breaks up a wave into a frequency spectrum.
  7. 14. an increase in the wavelength (and decrease in frequency/energy) of electromagnetic radiation, such as light, causing it to appear shifted toward the red end of the spectrum.
  8. 16. a colorless, odorless, tasteless, and non-toxic inert noble gas.
  9. 17. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
Down
  1. 1. the prevailing scientific model explaining that the universe began approximately 13.8 billion years ago from an extremely hot, dense point (singularity) and has been expanding and cooling ever since.
  2. 2. the faint, nearly uniform, remnant heat left over from the Big Bang, filling all space in the observable universe.
  3. 3. entire range of all types of electromagnetic radiation, organized by frequency, wavelength, and photon energy.
  4. 4. all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago. system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  5. 5. the range of wavelengths that trigger brightness and colour perception in humans.
  6. 7. German-American radio astronomer and physicist
  7. 9. the decrease in wavelength (and increase in frequency) of electromagnetic radiation (such as light) emitted by a celestial object moving toward an observer, shifting its spectrum toward the blue end.
  8. 12. the branch of science that deals with celestial objects, space, and the physical universe as a whole.
  9. 15. the lightest, simplest, and most abundant chemical element in the universe, featuring atomic number 1 (one proton).