Big Bang Theory

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Across
  1. 3. the simplest and lightest chemical element
  2. 6. second lightest element in periodic table that is a colourless, odourless, and tasteless gas
  3. 7. when light from a distant galaxy appears to shift colours when it is moving toward us
  4. 8. famous scientist that is responsible for the theory of relativity
Down
  1. 1. a massive system of stars , stellar remnants, interstellar gas, dust, dark matter, planets bound together by gravity
  2. 2. space, time, matter, galaxies, stars, planets and cosmic structures
  3. 3. influential scientist that discovered that galaxies are moving away from each other
  4. 4. when light from a distant galaxy appears to shift colours when it is moving away from us
  5. 5. acronym for a faint radiation left everywhere in the visible universe from the Big Bang
  6. 9. a celestial object composed mostly of hydrogen and helium that emits heat and light