It's not entirely accurate to say any planet has *no* atmosphere at all. Even the smallest bodies in space have *some* trace of an atmosphere, even if it's extremely thin.

However, some planets and celestial bodies have incredibly thin atmospheres that are considered negligible compared to the atmospheres of planets like Earth. These include:

* Mercury: Mercury has a very thin exosphere, consisting mostly of sodium, potassium, and hydrogen. It's so thin that it's practically considered a vacuum.

* The Moon: Similar to Mercury, the Moon has a very thin exosphere, primarily composed of helium, neon, and argon.

It's important to note that even though these bodies have very thin atmospheres, they still play a role in their environments. For example, the thin atmosphere of Mercury can help to regulate its temperature slightly.