Atmosphere: Composition, Pressure, and Layers

Solar Radiation Filtering: The atmosphere plays a critical role in filtering out solar radiation. The light from the sun is part of a larger electromagnetic spectrum, and the atmosphere prevents harmful radiant energy from reaching the Earth's surface.
Invisibility and Discovery: Air, a mixture of gases, is largely invisible and imperceptible under normal conditions, which historically delayed its understanding. It wasn't until the late $1700$ s that we began to comprehend what we breathe.
- Discovery of Oxygen: Oxygen ( $O_2$ ) was discovered in $1774$ . Joseph Priestley, known for his experimental, sometimes unscientific, approach, conducted experiments involving mice and sealed glass vessels. By observing that a mouse died in a sealed container but lived longer when a plant was present (though not explicitly stated, this is the context), and later demonstrated that a mouse died quickly without oxygen, he inferred the breathable component.
- Collaboration in Science: The concept of a