-
5 BYA
The solar system was made up of gas and dust. It was starting to be created. -
4.6 BYA
Earth began to form by collinding with space debris. -
4 BYA
Earth stopped the collisions with space debris and cooled down and organic molecules began to accumulate. -
3.5 BYA
The basic divisions of Earth were formed. -
3 BYA
The first known continent was formed. -
2.2 BYA
The Earth looks the way it does today. -
2 BYA-1.5 BYA
Plants were being formed. -
1655
Robert Hooke: studied nature by using an early light microscope. -
17th Century
Redi's Experiment: Used two jars of meat; one closed, one opened to show that life doesn't form outta nowhere. To show that spontaneous generation isn't real. -
1700s
Spallanzani's Experiment: Tested the hypothesis on spontaneous generation with broth in flasks to prove it's not true. One was opened and one was closed. -
Mid 1800s
Pasteur's Experiment: Controlled Spallanzani's experiment and proved to everyone that spontaneous generation isn't true. -
1920s
Oparin's Hypothesis: Organic compounds could enter complex chemical reactions fueled by energy from lightening and UV radiation. These reactions would have resulted in the macromolecules essential to life such as proteins. -
1952
Radiometric Dating: method of establishing somethinsg age -
1953
Urey and Miller: used Oparin/s hypothesis in an experiment and produced organic compunds and amino acids. -
1960's
Lynn Margulis: She created the theory on the orgin of eukareotic organelles. -
1970
Fox: Proved chemical reactions could occur spontaneously from nonliving organisms. -
1980's
Thomas Cech: found that RNA can act as a chemical catalyst.
