Just another silly question that may deserve a wise answer.
closed as off-topic by Eliran, Jishin Noben, Conifold, Dan Hicks, Mark Andrews Feb 21 at 18:25
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "While this question may be related to philosophy or occur in a philosophical context, the question itself doesn't seem to be about philosophy, and is therefore not a good fit for our site." – Eliran, Jishin Noben, Conifold, Mark Andrews
According to Wikipedia a flat universe would have this property:
Zero curvature (flat); a drawn triangle's angles add up to 180° and the Pythagorean theorem holds...
This is not the case for the round Earth which has positive curvature on its surface:
Positive curvature; a drawn triangle's angles add up to more than 180°...
The spherical objects in the universe may make it appear bumpy from a local perspective. From a more global perspective one would view the universe as flat having zero curvature even though those spherical objects within the universe have positive curvature.
"Shape of the universe" Wikipedia https://en.wikipedia.org/wiki/Shape_of_the_universe
Flatness or non-flatness of the universe is an issue concerning the large scale structure of the universe, more precisely a question about the curvature of spacetime.
Roundness of the earth and of other cosmic bodies is a local phenomenon due to the gravity of rotating bodies.
Here's a similar question: if this sheet of paper is flat, can the circle drawn on it be round? And the answer is yes. Of course.