Chapter One

Chapter One - Chapter One Angles right ascension &...

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Chapter One Angular separation – angle between a line drawn from observer to object Stellar Motions Stars circle pole star (Polaris) in 23h 56m 4s, one SIDEREAL day meteorites – oldest, interplanetary debris that can fall to Earth. 4.56 billion years old Sun – thermonuclear reactions convert hydrogen (sun’s primary constituent) into helium rate stars emit energy reveals lifespan nebulae/nebula – huge clouds of interstellar gas supernova – huge explosion with death of a star pulsars – dead spinning stars black holes – powerful gravity hole dead stars give off heavy elements Stars grouped randomly into galaxies “Galactic cannibalism” – large galaxies that devour neighboring galaxies quasars – a very luminous object with a large redshift and a starlike appearance. Can shine with brilliance of 100 galaxies. Draw energy from material falling into black holes
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This note was uploaded on 09/29/2009 for the course ASTR 101 taught by Professor Christiansen during the Spring '08 term at UNC.

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Chapter One - Chapter One Angles right ascension &...

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