Are hollow planets/astronomical bodies a physical possibility?

Question

This question does not include gaseous bodies.

Answer 1

If you mean a planet like earth only hollow.
It would not be possible,there is not enough strength in any substance that could do it.
Imagine building a bridge across the pacific ocean with no pylons to support it .
A hollow planet would compound this problem billions of times.

Answer 2

If you were determined enough you could hollow out a rocky object like an asteroid, or build a giant sphere from scratch. The 'Dyson Sphere' concept is a famous example. So they are of course physically possible, but unlikely to occur in nature, as massive objects tend to be formed by condensation of matter under the influence of gravity.