<p align="right">Last Update: <font color="#4f81bd">July, 24, 2024</font></p>
## BIG IDEAS
- The idea that Earth is a planet similar to other celestial bodies in the solar system was first suggested by the ancient Greek philosopher and mathematician Pythagoras in the 6th century BCE.
- Earth as one of the planets gained significant traction with the work of Nicolaus Copernicus in the 16th century
- [[Ernest Rutherford]] calculated the age of the Earth to be 4600 million years old
### Sources
[NASA: Atmospheric Layers](https://www.nasa.gov/mission_pages/sunearth/science/atmosphere-layers2.html)
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