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The Universe – What’s Out There?

The Universe – What’s Out There?. Friday, December 14, 2011. What do you see?. What is the universe?. What is astronomy?. = THE TOTALITY OF EVERYTHING THAT EXISTS!. = the scientific study of the universe. What are the main structures in the universe?. Stars Planetary Systems Galaxies.

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The Universe – What’s Out There?

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  1. The Universe – What’s Out There? Friday, December 14, 2011

  2. What do you see?

  3. What is the universe? What is astronomy? = THE TOTALITY OF EVERYTHING THAT EXISTS! = the scientific study of the universe

  4. What are the main structures in the universe? • Stars • Planetary Systems • Galaxies

  5. What are the main structures in the universe? 1. Stars:A star is a huge sphere of very hot, glowing gas held together by gravity

  6. What are the main structures in the universe? What is the name of the star that is closest to us? THE SUN! The Sun appears to bright because it is so close! The Sun is about 1 million times larger than Earth.

  7. What are the main structures in the universe? 2. Planetary Systems: a star and all of the objects that orbit the star • The Solar System (the Sun and its planets) is the name of our planetary system

  8. What are the main structures in the universe? Many of the stars that we see in the sky are part of their own planetary system.

  9. What are the main structures in the universe? 3. Galaxies: a collection of planetary systems bound together by gravity • galaxies are the major building blocks of the universe • the galaxy that we live in is called the Milky Way Galaxy

  10. What are the main structures in the universe? The Milky Way

  11. What are the main structures in the universe? • it is expected that there are > 170 billion galaxies in the universe, and each galaxies has millions to trillions of stars

  12. Now what do you see?

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