Lecture 01 202 Spring 2011

Lecture 01 202 Spring 2011 -...

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http://www.chem.unt.edu/~roberts/Pics/Fall/TESTprep2/ A Modern View of the Universe Our place in the Universe Earth is a planet in the Solar System. A planet o Orbits a star o Large enough for its own gravity to make it round o Has cleared most objects from its orbital path o A planet shines primarily by reflecting light from its star Solar System: o Sun o Planets and moons o Rocky asteroids o Icy comets The Sun is a star like those we see at night The Solar System belongs to the Milky Way Galaxy o Galaxy: Island of stars in space Hundred million to several trillion stars o Milky Way contains about 100 billion stars o Almost all the points of light we see at night are stars belonging to the Milky Way galaxy o The Solar System is located more than half way from the center of the Milky Way Billions of Galaxies o Groups of Galaxies (e.g.: local group) o Galaxy Clusters o Superclusters (e.g.: local supercluster) Large-scale structure of the Universe: giant chains and sheets of Galaxies and huge voids in between Astronomical Distances Kilometers (km), Miles (mi): Earth and Moon o Circumference of Earth: ~ 40,000 km (25,000 mi) o Earth-Moon distance: ~ 10 (Circumference of Earth) ~ 400,000 km o Radius of Sun: ~ 1.7 (Earth-Moon distance) ~ 696,000 km
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Lecture 01 202 Spring 2011 -...

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