3 ms·

Well that is the crux isn't it? How do we directly detect gravitational particles?

• snowwrestler 7y ago
  Maybe we don't. The evidence for general relativity is all indirect--we can't directly detect space-time. But plenty of people seem to think it's a solid theory anyway.
  • deleted 7y ago
    [deleted]
  • simonh 7y ago
    There is a significant difference in that GR made numerous very testable claims about all sorts of phenomena, which would not be at all expected without GR to explain them. It also depends what is consider direct detection, which I accept is a matter of opinion. For example I'd consider comparing the times on atomic clocks inside and outside a gravity well to be direct measurement of time dilation.