Stars, Galaxies and our Universe

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Earth and Space Based AstronomyCalifornia State Standard 2

Wow! Earth and Space Based Astronomy reveal some important things about:

• The structure and scale (size) of our Milky Way Galaxy

• The changes that occur in stars• The changes that occur in galaxies• The changes in the universe over time

Earth and Space Based Astronomy tell us that:

2a. Our solar system is located in an outer edge of the disc-shaped, spiral Milky Way Galaxy, which spans 100,000 light years across.

100,000 Light Years

We are here

Earth and Space Based Astronomy tell us that:

2b. Galaxies are made of billions of stars and comprise most of the visible mass of the universe.

Hey, What about me?

I have mass too!

Earth and Space Based Astronomy tell us that:

2c. All elements with an atomic number greater than lithium have been formed by nuclear fusion in stars.

I’m from the BIG BANG! Where

you from?

Kepler’s Supernova 1604.

Earth and Space Based Astronomy tell us that:

2d. Stars differ in their life cycles and . . .

Earth and Space Based Astronomy

2d. Visual, radio, and x-ray telescopes have been used to collect data so that we can understand how stars differ.

Earth and Space Based Astronomy tell us that:

2f. Color, brightness and evolution of stars are determined by a balance between gravity and nuclear fusion.

GStella

Earth and Space Based Astronomy tell us that:

2g. The red-shift from distant galaxies and the cosmic background radiation support the Big Bang model which suggest that the universe has been expanding for 10 to 20 billion years.

Raisin Bread model of the expanding universe