The outermost part of the atmosphere is called the exosphere. However, there are no orbits specifically "in" the exosphere. Here's why:

* The Exosphere: It's the region where the atmosphere gradually fades into space. It's so thin that particles rarely collide.

* Orbits: Satellites and other objects orbit the Earth based on their speed and altitude. They are not "in" the atmosphere but rather *above* it.

So, while some satellites may pass through the exosphere on their trajectory, they aren't orbiting within it.

Instead, satellites orbit within the thermosphere or low Earth orbit (LEO), which are significantly lower than the exosphere.