BIO-240 FA5 Chapter Notes - Chapter 1.5-1.8: Heterotroph, Outer Core, Archaea
26 Jan 2017
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Document Summary
Earth is the third of eight major planets that revolve around the sun. Evidence shows the sun and our solar system formed around 5 billion years ago from a cloud of gas and space dust called a nebula. Nebular hypothesis says that our solar system formed from a cloud of hydrogen and helium. These gases and dust particles began to contract under gravity, forming the sun. Small amounts of the nebular matter were left behind, forming the protoplanets that would eventually turn into our planets and moons. It"s believed that the moon was formed after a collision between theia and proto-earth. Proto-earth was larger than today"s earth and had no oceans or life. The sun condensed core became thermonuclear through thermonuclear fusion. Thermonuclear fusion is when hydrogen atoms becomes tens of millions degrees hot and combine to form helium and release energy. The sun also releases wind through ionized particles.
