Across
- 2. gravity, electromagnetism, strong nuclear force, and weak nuclear force
- 6. The interaction of electric currents/fields and magnetic fields
- 7. a region of space with such a strong gravitational pull, nothing can escape it.
- 9. an instrument for measuring the intensity of light
- 12. a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity
- 13. the distance that light travels in one year
- 14. the era that started when the gravitational effect of matter began to dominate the effect of radiation pressure
- 15. A period of rapid expansion of the universe in its first moments
Down
- 1. Any of a class of variable stars whose very regular light variations are related directly to their intrinsic luminosities
- 3. The science of the origin and development of the universe.
- 4. A system of millions or billions of stars, together with gas and dust, held together with gravity
- 5. the degree or intensity of heat present in an object
- 8. unit for measuring temperature
- 10. the apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object
- 11. the density of matter that would be required for the expansion of the universe to halt