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Astronomy 2015.notebook 1 April 28, 2015 The UNIVERSE has BILLIONS of Galaxies Galaxies: Clusters of stars We are in the Milky Way Galaxy Spiral Galaxy About 120,000 light years in diameter https://www.youtube.com/watch?v=NCweccNOaqo

The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed to form galaxies filled with stars. 5 Billion years ago, dense area became our

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Page 1: The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed to form galaxies filled with stars. 5 Billion years ago, dense area became our

Astronomy 2015.notebook

1

April 28, 2015

The UNIVERSE has BILLIONS of Galaxies

Galaxies: Clusters of stars               We are in the Milky Way Galaxy                                                                            Spiral Galaxy                                     About 120,000 light­                                          years in diameter

https://www.youtube.com/watch?v=NCweccNOaqo

Page 2: The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed to form galaxies filled with stars. 5 Billion years ago, dense area became our

Astronomy 2015.notebook

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April 28, 2015

Distances in space:

Light­Year: Amount of distance light travels in one year, about 9.5 trillion kilometers

Our Sun: 8 light­minutes away

Nearest neighbor star: 4.3 light years away

Page 3: The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed to form galaxies filled with stars. 5 Billion years ago, dense area became our

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April 28, 2015

Page 4: The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed to form galaxies filled with stars. 5 Billion years ago, dense area became our

Astronomy 2015.notebook

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April 28, 2015

STAR FORMATION:

Red Star (young) Reaction causes hydrogen to change to helium, releasing energy in light and heat.Color changes to orange, yellow or white. Then stabilizes. 

Our Sun, average size yellow star.  When hydrogen used up:   Star collapses

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April 28, 2015

Solar System:

Big Bang Theory:Universe created 10­15 billion years ago Violent expansion of mattrer and energy.

Expanding dust and gases condensed to form galaxies filled with stars.

5 Billion years ago, dense area became our sun.

Soon, other material condensed into planets, moons, etc.

Page 6: The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed to form galaxies filled with stars. 5 Billion years ago, dense area became our

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April 28, 2015

The biggest and the smallest 45 minhttps://www.youtube.com/watch?v=zVR106sznNw