vocab

2. unit of measurement equal to the distance light travels in one year
4. collects the light from distant stars and separates that light into bands of different colors
5. the galaxy our solar system belongs to
7. uses mirrors to focus light rays
8. formed when celestial bodies such as planets and moons orbit around a star
9. galaxies that have a nucleus of bright stars and two or more spiral arms that wind outward from the center ex. The Milky Way Galaxy
10. telescopes – receive radio waves emitted from objects in space
11. a collection of stars, gases, dust, and planets, and other astronomical bodies held together by gravity.
12. theory that the universe expanded from a hot, dense initial condition at a specific point in time around 13 billion years ago
13. existing matter and space considered as a whole; the cosmos.

1. galaxies shaped like spherical or flattened disks, similar to a football shape
3. shift in light toward the red end of the visible light spectrum due to the wavelengths of light from galaxies being stretched as they move away from Earth
6. galaxies that have many different shapes and are smaller than other types of galaxies
7. uses convex lenses to bend and focus light rays