Across
- 2. The types of elements and substances present in a given object or system.
- 5. When a light source is moving away from us, the wavelength of the light appears to stretch, shifting towards the red end of the spectrum
- 6. The galaxies are moving away from us, and the further away they are the faster they are moving
- 9. The prevailing scientific explanation for how the universe began
- 10. shifts in wavelengths of light toward the blue end of the spectrum as an object moves toward us in space.
- 11. When light passes through a cool, gaseous substance, such as an interstellar cloud, specific wavelengths of light are absorbed by the atoms or molecules in the cloud.
Down
- 1. The sound waves compress as the vehicle approaches and stretch as it moves away.
- 3. The universe has always existed and will continue to exist in the same state
- 4. When an atom or molecule absorbs energy, its electrons move to higher energy levels.
- 7. A faint glow of radiation that fills the entire universe
- 8. When light moves away from an observer, the wavelength of the light stretches, causing a shift towards the red end of the electromagnetic spectrum
- 12. Provides crucial evidence about the composition of matter in the universe