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Astronomy (2) - • 1 light year = 5.88 trillion miles •...

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Astronomy – the study of the universe 2 ideas about the big bang universe started out hot the hotter the universe started the more mass in the universe the universe cools as it expands Nuclear fusion in stars creates higher elements Evolution of the stars releases the elements New stars form with higher content of these higher elements Planetary systems are formed Degenerate matter When it occurs within seconds the star goes nova This is when the other elements start to become created Stars → Galaxies → Super Clusters Rotate on earth at 600 mph Orbiting around the sun 60,000 MPH Traveling in the Milky Way 500,000 MPH Traveling in local group at 180,000 MPH light is energy (photons) light travels at finite speed light speed = 2.9979 x 10^8 meters per second
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Unformatted text preview: • 1 light year = 5.88 trillion miles • light allows us to look back in time • a light year is not time, its distance • scale of solar system • stellar scales • galactic scales • universe scales • human scale in the universe • 1 Astronomical unit = the distance from earth to the sun • scale of the solar system • constellation is a region of the sky • 88 constellations in the sky • why do stars rise and set • the zenith is the point where the sun is absolutely above you • the horizon is where earth meets sky • angular size: the angle the observed object spans in your view • angular distance: the angle that seems to separate the two objects • why do we see diff. Constellations at diff times of the year`...
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