I was thinking about a theoretical planet/moon, and I wanted to know if it could actually exist or if there was some inherent problem with it. I figured that you people could probably answer my question. Anyways, the basic concept of the planet is that it rotates faster than an orbit infinitely close above the surface would travel. Obviously anything on the surface would be flung off so there would be no dust, atmosphere or rocks, and it would probably have to be made of some strong metal. Also I'm not sure how it got to be spinning so fast, but I'm just interested in if there is a problem with a planet like this theoretically, not whether it's realistic for it to exist or not. Things I figured out about the planet (feel free to tell me I'm wrong): A: It would be nigh-impossible to land on. You would expend massive amounts of delta-V because you would have to 1. speed up to be at its surface speed 2. manipulate your path as you flew so as not to zoom off into space. I think you'd be burning down and prograde unlike a regular landing retrograde and up. You'd also have to tether your ship and yourself down. B: Standing in a cave inside it, the center of the planet would be above your head because centripetal force would be greater than gravity. C: It would be trying to fling itself apart, so it would have to be very strong. D: Small asteroids that are spinning fast are this already, but they aren't interesting because they have so little gravity. So anyways let me know if a planet like that can't exist for some reason, or if you can figure out something else interesting about a planet like this.