1. The Universe… …is space and everything in it.

3. Galaxies (1)
A galaxy is a cluster of stars, gas, and dust that are held together by gravity.
There are three main types of galaxies:
Irregular
Elliptical
Spiral

5. Irregular Galaxy (1 of 1) do not have a definable regular shapes
young stars, dust, and gas.

6. Elliptical Galaxies (1)
look like a flattened balls or egg
has little gas and dust, and this prevents new stars from forming
Only old stars can be found here.

7. Spiral Galaxy (1) flat, rotating disk with stars, gas, and dust
Spiral arms that wrap around like a pinwheel
Has a central group of stars, known as the bulge.
Contains middle aged stars

9. Elliptical Galaxy Irregular Galaxy Spiral Galaxy
Match the galaxy with the correct picture. A
Elliptical Galaxy Irregular Galaxy Spiral Galaxy B C

11. Milky Way Galaxy (1)
a type of spiral galaxy known as a barred spiral galaxy.
Our Sun is located at the edge of the Milky Way galaxy.

13. Nebulae (plural for Nebula) (1)
A gigantic cloud of gas and dust where stars are made
also called a “Stellar Nursery”

14. Stars (1) form in a nebula when gravity pulls gas and dust together
hydrogen gas forms into helium through nuclear fusion
Vary in mass, size, and temperature
Held together by gravity
Our star is called the “Sun”

16. Sun
Medium Sized Star Yellow Main Sequence Edge of milky way galaxy Will become a white dwarf when it dies

18. H-R Diagram
Shows the life cycle of a star and Classifies them using their
Size
Temperature
Brightness/Magnitude/luminosity (The amount of light a star gives)