A. Gravity. According to Einstein’s theory, massive objects like planets and stars create a “distortion” or “dent” in spacetime, like a heavy object placed on a blanket or trampoline. We experience this as gravity.
D. All of the above. Over the last century, scientists have observed many natural phenomena that help confirm Einstein’s theory. Read more about it here.
C. It’s complicated. Although scientists have confirmed the theory many times over, it doesn't explain every natural phenomena we encounter — especially those that occur on a very small scale, like in quantum physics.
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