Across
- 3. the intensity, or brightness, of light from a celestial body, which can be used to identify the body’s characteristics
- 4. electromagnetic radiation that fills the universe and is left over from the early development of the universe
- 6. the number of a waves that pass in a period of time
- 10. all of space and the matter it contains
- 14. the change in wavelength that allows us to determine if an object is moving toward us or away from us
- 16. the remains of a star or other large object that collapsed under its own gravity to form a superdense object with gravity so strong that even light cannot escape its pull
- 18. the remains of a meteor that lands on Earth
- 20. the first stage in the life cycle of a star
- 21. the top point of a wave
- 22. the type of energy released by stars consisting of electric and magnetic waves that travel at the speed of light
- 23. a theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago
- 24. a huge ball of gas that produces its own energy
Down
- 1. the death of a large star by explosion
- 2. a large, rocky celestial object orbiting the sun
- 5. a celestial body of ice, dust, and rock with a fan-shaped tail and elliptical orbit
- 7. large cloud of gas and dust in interstellar space; the location of star formation
- 8. the distance light travels in one year
- 9. the length of a wave, measured as the distance between the same point of two adjacent waves
- 11. a meteoroid that enters Earth’s atmosphere from space and starts burning due to friction
- 12. a small chunk of rock or dust in space
- 13. the height of a wave
- 15. the bottom point of a wave
- 17. a grouping of all possible energy levels of electromagnetic radiation
- 19. a large system of gas, dust, and stars and their solar systems, all held together by gravity