Across
- 1. only 4% of the matter in the Universe is visible. The rest is known as dark matter-26% and dark energy-70%
- 6. a form of energy that pervades the universe and produces a force that counteracts the gravitational attraction between galaxies
- 8. the generalization that the speed of recession of distant galaxies is proportional to their distance from the observer
- 9. A physicist who studies the stars
Down
- 2. of or concerned with astrophysics
- 3. A collection of star systems, any of the billions of systems each having many stars and nubulae and dust
- 4. the physical phenomenon of radiating energy in the form of waves or particles
- 5. everything that exists; all matter and energy; also includes all of space and time
- 7. pertaining to the branch of astronomy dealing with the history and structure and dynamics of the Universe
- 8. to believe especially on uncertain tentative grounds