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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. - PowerPoint PPT Presentation
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The Universe – What’s Out There?
Friday, December 14, 2011
What do you see?
What is the universe?
= THE TOTALITY OF EVERYTHING THAT EXISTS!
What is astronomy?= the scientific study of the universe
What are the main structures in the universe?
1. Stars2. Planetary Systems3. Galaxies
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
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.
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
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.
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
What are the main structures in the universe?
The Milky Way
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
Now what do you see?