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(5 BYA) Creation of the solar system
dust collected towards a center of the solar system. There gravity created a star from the large quantities of gas. The left over dust from this creation of a solarsystem swirled around the star. -
(4.6 BYA) Earth formation
The left over dust from the creation of the sun and solar system starte colliding and created large rocks in space. Throughout time the gravity between the rocks and the friction from the collisiong generated a large planet. -
(4 BYA) Volcanos began to form the atmosphere
As early earth formed large quantites of gas were being generated within the planet. This generated large volcanoes which expelled lava and various gases. These gases would have been kept swirling around earth due to its gravitational pull. -
(4 BYA) First organisms on earth
Electrical activity on early earth generated basic molecules for life. These organism were anerobic and heterotrophic. -
(3.5 BYA) Stromatolites
The early organism began to form collonies called stromatolites where the early organisms thrived. -
(3 BYA) Organisms can become photosynthetic
The early organisms of earth begin to use carbon dyoxide to produce food. This process wil become known as photosynthetic. This process allowed more efficient energy production and the release of oxygen into the atmosphere. -
(2.2 BYA) Modern view of Earth
Land and water levels of modern day earth are reached. The resulting planet looks very similar to the planet we see today. Small continets begin to emerge, plates on earths surface begin too shift. -
(2 BYA) Oxygen reached today's level
The oxygen levels of early earth reach the same levels that exist in modern day earth. This allows organisms to thrive and life to become more present. This would have happenex by the gases released by early organisms and other natural events. -
(1,5 BYA) Prokaryotes grew inside bigger prokaryotes
Larger organisms begin to form to allow a basic circle of life to be created. The organisms that first inhabited the earth begin to survive by living inside of larger more adapted organisms. -
(1 BYA) Ozone formed
The Ozone layer started to form when the oxygen on earth reached the upper part of the atmosphere. There, the oxygen was more exposed to the sunlight. Some part of the sunlight was able to split the oxygen into highly reactive single oxygen atoms. The newly formed atoms reacted with the other oxygen atoms and created ozone, which protected life form UV light. -
Redi's experiment (1650)
Redi's experiment was one of the first experiment to test if life was created from spontaneous generation or biogenesis. He placed rotten meat into two different jar. He left one of the jar open as control group and covered the second one as his experimental group. After a few weeks, he realized that there was no flies or maggot on the rotten meat in the covered jar. He then concluded that maggot was carried through the air and appeared from biogenesis. -
First microscope (1665)
The first microscope allowed scientists to observe things they previously were not able to. Being a light microscope, they could see organism that were alive and too small to see with the unaded eye. -
Spallanzani's experiment (1745)
Spallanzani wanted to go further with Francesco Redi's experiment. He put broth in two different jar. After boiling both of them, killing all the germs in it, he put a cap on one of them, leaving the second one open. After a few days, the broth in the open flask became cloudy. He concluded that the microorganisms tht contaminated the broth were in the air. All were not conviced however. -
Oparin's hypothesis (1920)
Oparin's hypothesis was that the early earth contained many different gases. Furthermore, he explained that those gases reacted at high tempereatures to create amino acids. Those amino acids would then enter a more complex chemical reactions froming proteins. -
Radiometric dating (1950)
Radiometric dating is a way to determine how old an object is by calculating the proportion of isotopes of certain atoms in the object. A common atom used in carbon. For object less than 60 000 old, scientists calculate the ratio of carbon-12 to carbon-14 in it. The ratio will change because of htehalf-life of carbon. -
Urey and Miller (1953)
Urey and Miller were scientists who tried to prove Oparin's hypothesis. In a closed path, they inserted water vapor all the gases that Oparin said were present in early earth. They also added electrodes to represent the lighting present in the early earth. At the end of the path was an organic compound. When they analyzed the compound, they found that it contained amino acid. -
Lynn Margulis (1960)
Lynn Margulis is an American Biologist who proved that chloroplasts and mitochondrion were created by a process called endosymbiosis. Endosymbiosis is a mutualy beneficial relationship between two organisms where one lives inside the other. -
Sidney W. Fox (1960)
Sidney Fox was a scientist that made research on the structures that gave rise to the first cells. He was working with two types a structures in particularly: microsperes and coacervates. -
Thomas Cech (1980)
Thomas Cech was a researcher that found that some type of RNA, in some unicellular eukaryotes, can act as chemical catalyst. He named those RNA molecule ribozyme. -
Pasteur's experiment (1850)
Pasteur's experiment was the final major experiment to show that spontaneous generation was a myth. Many people said that Spallanzani's experiment was wrong becaused he boiled the broth too long. Pasteur executed the same type of experiment, but he used a flask with curve-necked.The broth stayed clear for years and when the neck was broke, it became cloudy.
