Across
- 4. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 5. I have glasses :).
- 7. Bang A theory about the creation of the universe.
- 8. The emission of energy as electromagnetic waves or as moving subatomic particles
- 10. Spectra of light emitted by galaxies, moving away from the Earth with a low frequency.
- 11. The study or series of past events.
Down
- 1. Change in frequency of a wave for an observer moving relative to its source
- 2. A measurement of waves (e.g. sound waves).
- 3. Word for the universe constantly moving at a rate from the Earth.
- 6. An endless system that contains every kinds of galaxies, planets and stars but is also mostly made of empty spaces in between.
- 9. A very large ball of burning gas in space that is usually seen from the earth as a point of light in the sky at night.
- 11. The person who discovered spectra of lights were emitted by galaxies that can be used as the first piece of evidence of the Big Bang theory.