Across
- 5. Energy emitted by the hot, dense early universe
- 6. The second most abundant element created in the early universe.
- 8. A gravitational bound system of stars, gas, and dust.
- 9. The stretching of light to longer wavelengths
- 10. The leading explanation for how the universe began.
Down
- 1. element, not a lot found but still present.
- 2. The most abundant element formed after the Big Bang.
- 3. Everything that exists: matter, energy, space, and time.
- 4. leftover thermal energy radiation
- 7. The action of the universe stretching and growing over time.