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23 - Our sun is just one of 70 thousand million million...

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Nats 101 23/01/2008 16:58:00 The Big Bang Theory… The universe began with an episode of rapid expansion (Big Bang) from a  much more compact form somewhere between 11 billion and 20 billion years  ago… It created very simple elements (hydrogen, helium) from subatomic particles. o Hydrogen has 1 proton + 1 electron 75% of the earth is made up of Hydrogen o Helium has 2 protons+ 2 neutrons+ 2 electrons Hydrogen (and helium) formed soon after the Big Bang Other elements and complex compounds formed during the life cycle of stars Stars use hydrogen as fuel... Stars vary in size 1 Billion= one thousand million (1000,000,000) Big Bang happened 15 thousand million Our solar system formed around 4.6 billion years ago
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Unformatted text preview: Our sun is just one of 70 thousand million million million ← When stars form they are surrounded by a rotating disk of cosmic debris ← Gravity pulls debris together to form planets that revolve in a consistent direction around the star ← Sun= 99.8% of total mass of our solar system ← Terrestrial Planets (Mercury, Venus, Earth, Mars) • Composed of rocks • Divided into compositional layers o Crust- lighter elements o Mantle o Core- heavier elements ← Jovian Planets (Jupiter, Saturn, Uranus, Neptune) ← Large, gas giants ← Characterized my many moons and ring systems ← The Earth is tilted 23.5 degrees ← 23/01/2008 16:58:00 ← 23/01/2008 16:58:00 ←...
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