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The solar system was a swirling mass of gas and dust later pulled together to create the sun. The extra debris collided to form the planets.
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The Earth was formed it took 400 million years. Earth formed through all of the extra debris pulling together after the solar syatem formed.
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Earth’s age this was founded by scientists studying the sedimentary rocks in the Earth’s crust, this is the age of the oldest known rocks and crystals.
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The isotopes had unstable nuclei and when through radioactive decay. These are called radioactive isotopes and have a half-life.
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The age of the oldest found stromatolites fossils.
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Forms of life became photosynthetic.
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O2 reached the upper parts of atmosphere where the sunlight is.
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O2 levels reached today’s levels, helps to protect life from ultraviolet radiation.
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A small aerobic prokaryote began to live and reproduce inside larger prokaryotes through energy synthesis.
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Ozone (O3) formed – protected organisms from harmful UV rays so they could exist on land.
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In 1665, Robert Hooke studied nature by using an early light mcroscope; he discovered cells in a thin piece of cork.
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In 1668, Francesco Redi conducted an experiment to test his hypothesis that meat kept away from adult flies would stay free of maggots.
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By the mid-1800s, Louis Pasteur conducted an experiment to answer objections to Spallanzani’s experiment & reasoned that the contamination was due to microorganisms in the air.
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In 1953, Stanley Miller and Harold Urey set up an experiment using Oparin’s hypothesis as a starting point. They sent electrical currents through gases that were believed to be Earth's early atmosphere. When the gases cooled, they thickened to make a salt water-like liquid that had things in it like amino acid, what is found in present-day cells.
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During the 1960s, Sidney Fox founded microspheres and did research on the physical structure of cells.
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In 1989, Thomas Cech and his research group did the work leading to the discovery that RNA can self-splice and thus can act as a ribozyme.
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In 1700s, Lazzaro Spallanzani concluded that the boiled broth in his experiment became contaminated only when microorganisms from the air entered the flask.
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In the 1920s, Soviet Oparin proposed that at high temperatures, ammonia, hydrogen gas, water vapor, & compounds made of hydrogen and carbon, might have formed simple organic compounds like amino acids.
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In 1967, Lynn Margulis postulated the endosymbiotic theory, which is the theory that the mitochondria and chloroplasts contained within modern animal and plant cells were once free living bacteria that were engulfed by another bacterial cell leading to the eukaryotic cell.
