Our Place in the Universe

Our Place in the Universe - OurPlaceintheUniverse 15:36

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Our Place in the Universe 15:36 The universe is the totality of space, time, matter and energy. Terrestrial planets are those that resemble earth(earthlike) From the sun to the earth is 1.5*10^11metres  However since this number is too large to actually comprehend it is referred to as  an AU or astronomical unit. Light Year -measure of the distance. From the sun to the nearest star is 1 LY or  light year. One LY=9.46*10^12 km The distance between the sun and the centre of the galaxy is 26000. If light moved at an infinite speed, we’d be able to see everything as it is now. We  see things the way they were in the past and in a sense are looking back in time.  (3 billions of a second per 1 meter) We see the sun the way it was 8 minutes ago. We see light that left the  Andromeda galaxy 2.5 million years ago. Distant galaxies=billions of years ago.  Stars  are huge spheres of super hot gas (plasma) that produces energy by  nuclear fusion(smashing atoms together). The sun is a fairly typical star.
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This note was uploaded on 05/20/2011 for the course ASTR 101 taught by Professor Minatsky during the Spring '11 term at University of Toronto- Toronto.

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Our Place in the Universe - OurPlaceintheUniverse 15:36

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