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And gravitational stuff. We kinda know it does it, but not how to do anything about it.
Surely that's "heavy stuff"?
And maybe also "big stuff". I suppose those two overlap quite a lot?
A nebula is one exception
I thought that meant black holes
How about something simple: Why does gravity feel the same as acceleration?
You can't feel gravity. What we feel really is acceleration, the acceleration of the earth pushing us up against gravity.
Because of relativistic frames of reference.
Standing on a surface in a gravity well means you're being constantly pushed out of an inertial frame, by not allowing you to follow a geodesic path in spacetime, and the same effect happens under acceleration.
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