lol. Yeah.. I guess I don't know first hand either.. Although considering more the other celestial bodies in our system appear to be round I assume ours is too.

The corkscrew orbits makes sense for sure.. Given that we're supposedly spinning around the central point of our milky way.

Hollow earth is improbably but possible.. The physics involved with that type of thing don't pan out for me.. But I have no proof that it is or isn't personally.