Across
- 3. equivalent to 1.8 billion degrees Fahrenheit
- 6. the change in frequency of a wave in relation to an observer who is moving relative to the wave source
- 7. an object is moving towards us the light from the object is called this
- 10. interactions that do not appear to be reducible to more basic interactions
- 12. the study of the relations between heat, work, temperature, and energy and the law describes how the energy in a system changes and whether the system can perform useful work in its surroundings
- 17. a center of effective repulsion in the large scale flow of galaxies in the neighborhood of the Milky Way
- 18. the universe at an extremely high state of energy
- 19. the pressures which kept the matter from clumping together is now greatly reduced (gravitational effect begins to dominate the effect of radiation pressure)
- 23. pair of two subatomic particles which are identical in every way except they have opposite charges
- 24. the study of the nature and evolution of the universe
- 26. the distance light travels in a year
- 28. electromagnetic radiation from the big bang
Down
- 1. a dark or bright line in an otherwise uniform and continuous spectrum resulting from an excess or deficiency of photons in a narrow frequency range compared with the nearby frequencies
- 2. the telescope that studies the formation of distant galaxies and planets in our solar system without the interruption of Earth's atmosphere
- 4. georges lemaitre invented this model
- 5. albert einstein discovered the fate of the universe depends on whether or not this is above or below
- 8. a device that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum
- 9. a region of space-time so dense that nothing can escape its gravitational pull, not even light
- 11. variable stars that are intrinsic variables which pulsate in a predictable way
- 13. a period of extremely rapid expansion of the universe in the first few moments
- 14. stars begin to cluster to form these
- 15. an object moving away from us the light from the object is known as this
- 16. the physical interaction among the electric charges, magnetic moments, and the electromagnetic field
- 20. a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity
- 21. the process inside a star's core where hydrogen fuses into helium
- 22. a space with few to no galaxies in it
- 25. a region of space where the curvature of spacetime becomes infinite
- 27. the observed displacement of an object caused by the change of the observer's point of view