* Earth: Earth has a substantial atmosphere, primarily composed of nitrogen (78%) and oxygen (21%). This atmosphere is essential for life, protecting us from harmful solar radiation, regulating temperature, and enabling weather patterns.
* Moon: The Moon has an extremely thin atmosphere, called an exosphere. It's so thin that it's barely considered an atmosphere at all. It's composed mainly of helium, neon, and argon, and it's constantly being lost to space. The Moon's lack of a significant atmosphere is why it has no weather and experiences extreme temperature swings.
In short: Earth has a thick, life-supporting atmosphere, while the Moon has a practically nonexistent exosphere.
