The Earth's atmosphere doesn't have a defined end, as it gradually thins out into space.

However, the Kármán line, which is generally considered the boundary between the atmosphere and outer space, is about 100 kilometers (62 miles) above sea level.

Here's a breakdown:

* Thermosphere: This layer extends from about 80 km (50 miles) to 600 km (370 miles). It's where the space shuttle orbits and where the International Space Station is located.

* Exosphere: This outermost layer extends beyond the thermosphere and gradually fades into space. There's no clear boundary where it ends.

So, while the atmosphere technically extends beyond the Kármán line, it's considered the practical limit.