vocab

5. the galaxy our solar system belongs to
7. receive radio waves emitted from objects in space
9. uses mirrors to focus light rays
12. theory that the universe expanded from a hot, dense initial condition at a specific point in time around 13 billion years ago
13. unit of measurement equal to the distance light travels in one year
14. formed when celestial bodies such as planets and moons orbit around a star

1. a collection of stars, gases, dust, and planets, and other astronomical bodies held together by gravity.
2. uses convex lenses to bend and focus light rays
3. existing matter and space considered as a whole; the cosmos.
4. 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
6. galaxies that have many different shapes and are smaller than other types of galaxies
8. 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
10. collects the light from distant stars and separates that light into bands of different colors
11. galaxies shaped like spherical or flattened disks, similar to a football shape