Across
- 2. Idea that expansion due to dark energy will continue and that eventually everything will be ripped apart including stars, galaxies, and even atoms
- 4. Idea that expansion will eventually slow due to gravity and then reverse and that all the universe will collapse back together into a single point; has been disproved as the expansion force of dark energy is greater than the contraction force of gravity
- 10. The mysterious force that is accelerating expansion of the universe; this makes up 65% of the universe
- 11. Anything that takes up space and has mass
- 15. Idea that due to expansion, galaxies and stars will become so distant from each other that no other light can be seen. The universe will be a cold, dark, lonely place
- 17. A ratio of 75% hydrogen atoms and 25% helium atoms is measured throughout the universe which matches the prediction from the big bang theory
- 19. The extremely rapid expansion of the universe outward from the singularity point. This happened faster than the speed of light.
- 20. Extremely bright objects in the universe, but also very far from earth; object may be light emitted from the "accretionary disc" around a super-massive black hole
Down
- 1. The leftover heat energy from the Big Bang that is visible in every part of the universe
- 3. The distance between identical points in a waveform signal
- 5. A Doppler effect of light where the wavelength is stretched out, shifting it toward the red end of the spectrum
- 6. A fundamental force of the universe that any object with mass will exert a gravitational pull on any other object with mass
- 7. The idea that the universe always existed in much the same size and composition as we now observe it; this theory was replaced by the big bang theory
- 8. The science which studies how the universe began and how it has changed over time
- 9. The rate at which something occurs or is repeated over a particular period of time
- 12. An infinitely small, infinitely dense, and infinitely hot point from which the universe expanded
- 13. Galaxies are moving away from Earth at a rate proportional to their distance from Earth, meaning distant galaxies are receding faster than closer galaxies
- 14. The generally accepted theory to explain the origin of the universe, which states that the universe formed during a single event in which all matter and energy suddenly expanded from an extremely small point
- 16. The magnitude of the wave height
- 18. Matter or mass in the universe that we cannot see directly and can only see its gravitation effect on stars and galaxies