EARTHSC 1100 Lecture Notes - Lecture 2: Homo Erectus, Australopithecus
18 Jan 2018
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The sun is inside that, and we move around it. This can also be written (13. 7 x 10^9 years) Move the decimal over 9 places to the right. Gonna want a calculator for the midterm (ee) It all started with the big bang or cosmic singularity 13. 7 billion years ago. Every single calcium and atom, hydrogen and oxygen, came from the big bang. There are billions of stars, one of them happens to be the sun. 4. 6 billion years ago, or in september, the solar system is created. He might ask us to order these things chronologically. The rst life forms to show up on earth were prokaryotes, 3. 5-4 billion years ago. He calls them germs, but this isn"t exactly accurate. When we hear photosynthesis, we think of leaves, but prokaryotes are di erent. Don"t drink/swim in the water with pond scum on it. Humans couldn"t exist before this because there was no oxygen on earth.
