Across
- 3. an astronomical unit of measurement
- 7. the study of the whole universe
- 9. a theory of exponential expansion of space in the early universe
- 10. change in observed wavelength, or frequency
- 12. the observed displacement of an object caused by the change of the observer's point of view
- 14. instruments that measure electromagnetic radiation
Down
- 1. A black hole is a region of spacetime where gravity is so strong that nothing can escape
- 2. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 4. an increase in the wavelength
- 5. a unit used to measure tempurature
- 6. a completely empty space
- 7. cosmic benchmarks for scaling galactic and extragalactic distances
- 8. the twin of almost all the subatomic particles that make up our universe
- 11. a hypothetical form of matter thought to account for approximately 85% of the matter in the universe.
- 13. everything in the universe beyond the top of the Earth's atmosphere
- 15. the indefinite continued progress of existence and events in the past, present, and future regarded as a whole.