>Only if you believe the theory of relativity is correct.

https://bohring.substack.com/p/how-do-we-know-that-general-r...

https://en.wikipedia.org/wiki/Tests_of_general_relativity

https://www.researchgate.net/post/Why_you_think_that_general...

https://archive.ph/iVZZu

https://www.livescience.com/black-hole-image-shows-einstein-...

Und so weiter, und so weiter...

I can show you plenty of tests "proving" that Newtonian mechanics are correct too. General relativity doesn't correctly predict things at quantum scale.