ISP 205 Lecture Notes - Lecture 1: Milky Way, Orion Nebula

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Our address: east lansing, earth, solar system, milky way galaxy, local group of. Our solar system: 8 planets, 2 dwarf planets, 65+ moons, comets, asteroids, dust, gas. The distance to the sun is about 10,000 times earth"s diameter. Our sun is 27,000 light years from the center of the milky way. Lightyear: the distance light travels in a year. The sun is 10 light minutes away from earth. Nearest star is about a light year away. Stars live and die when they run out of fuel. Both kinds eject elements heavier than hydrogen into space. New stars and planetary systems form from the material of dead stars. Recently formed stars in a dense, opaque gas cloud.

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