Introduction to Astronomy Notes

Introduction to Astronomy Notes - Introduction To Astronomy...

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Introduction To Astronomy The sun will take 7 billion years to turn into a giant red ball - Sun is middle aged What do astronomers observe after a star has died? How do scientists know the fate of our Sun? - Observing other stars at different stages of life The sun located 2/3 from the galaxy Milky way is second largest massive galaxy in mass to Andromeda Galaxy The number of spiral galaxies is decreasing with time lets scientists know that the universe is evolving Nebulous is not a galaxy Galactic Cannibalism – larger and smaller galaxies emerges After big bang, it was so hot that hydrogen fuses to helium As hydrogen fuses to helium, gamma rays reddened into microwave bands Cosmic Microwave Background is a theory Big Bang would be correct o CMB is the remnant of hydrogen fusion during very young universe Planets - 3 categories: planets, dwarf planets, and small solar system bodies Layout of Solar System - Sun, Mercury, Venus, Earth, Mars, Jupiter*, Saturn*, Uranus*, Neptune* - - *= Gas Giant - Planet Rules 1. Must orbit the sun 2. Must be massive enough to become spherical under it’s on gravity 3. Must clear its own orbit
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Dwarf Planets only follow rules number one and 2 (order from the distance from the sun) 1. Ceres – the third dwarf planet and the largest asteroid in the asteroid belt 2. Pluto - Kuiper Belt Object and a dwarf planet – also known as Xena 3. Eris – the largest dwarf planet and Kuiper Belt mass today – 3 times further away from the sun than Pluto Terrestrials Planets (Mercury, Venus, Earth, Mars) - Terres means land - All terrestrials are rocky - Exist close to the sun
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This note was uploaded on 03/19/2010 for the course ASTR 1101 taught by Professor Campbell during the Spring '08 term at LSU.

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Introduction to Astronomy Notes - Introduction To Astronomy...

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