Question: Despite passing all tests so far, some physicists believe general relativity may not be the correct theory of gravity. Which of the following is /

Despite passing all tests so far, some physicists believe general relativity may not be the correct theory of gravity. Which of the following is/are a common cause for concern that general relativity might be wrong among physicists?
The requirement of current models that 95% of the universe is made up of unknown types of matter.
The fact that we have not yet detected Hawking radiation.
Aliens.
General relativity has made few predictions that have been verified.

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