What? Is a Uranus sidereal day the same length as its year?
A 3D map of the Milky Way Galaxy, shown below was constructed based on physical inferences from distance and location measurements using thousands of Cepheid variable stars.
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Image credit: Dorota M. Skowron, Jan Skowron, Przemek Mróz, et al., SCIENCE
2 Aug 2019 Vol 365, Issue 6452, pp. 478-482
It isn't flat, it is a barred spiral galaxy, it has a twisted S-shaped structure, and it "shows the structure of our Galaxy’s young stellar population".