Across
- 2. The longest wavelength of visible light is this color.
- 3. Edwin ________ discovered that the different galaxies in the universe (that is groups of stars, nebulae and solar systems) were moving away from one another.
- 5. Before the Big Bang theory, scientists believed the universe was ________, that is, it had no beginning.
- 7. The Big Bang theory proposes that at the beginning of the universe all matter and energy was condensed into a very _______ space.
- 8. The Big Bang shows that the universe isn't eternal but had a _________.
Down
- 1. Georges Lemaître, who first proposed the theory of the Big Bang was a Catholic ________.
- 4. Light moves up and down and left and right as it moves forward. In other words it is a wave.
- 6. The reason that the Big Bang was proposed is because the universe is __________. That is, every object is moving apart from one another.