9:3:09 Introduction - o Some we can see all year, and some...

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Introduction 03/09/2009 07:58:00 9/3/09 Astronomy -  the physical science of the cosmos - planets, stars, galaxies, the  universe Implications of Constant Speed of Light C = 3 x 10 5  km/s     PERIOD    It is the law. o Because the speed of light is constant, when we see distant galaxies,  we see them, as they were billions of years ago. Allows us to study the universe when it was young Humans have only been in the universe for a tiny fraction of its existence, but  we can study nearly all of it Metric Units Astronomy in an international subject, so metric is used o 1 km   ->   .6 miles The Orbit of the Earth Around the Sun Why we see different stars at different times of the year
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Unformatted text preview: o Some we can see all year, and some we cant see at all from the northern hemisphere o Coupled by a 23 degree tilt on its axis, pointing either hemisphere closer to the sun Why we have the seasons! The Orbit of the Moon Around the Earth Moon rotates around the earth with a 27 day period o This causes us to see phases The moon rotates on its axis in exactly the same time as it orbits Earth The same side of the moon it always facing the Earth Eclipses o Lunar Earth between Sun and Moon, casts shadow on Moon o Solar Moon between Sun and Earth, casts shadow on Earth A solar eclipse occurs during a new moon...
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This note was uploaded on 10/17/2011 for the course ISP 205 taught by Professor Donahue during the Fall '08 term at Michigan State University.

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9:3:09 Introduction - o Some we can see all year, and some...

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