Question

einsteins theory of general relativity is currently the best explanation of gravity. why has this theory not been replaced with a new one?

a. it still explains the experimental evidence pertaining to gravity.

b. scientists assume it is correct and therefore no longer perform experiments on gravity.

c. because of einsteins fame, it remains popular among scientists.

d. the force of gravity has been shown to remain constant over time.

Explanation:

• Option A: Scientific theories are retained if they explain experimental evidence. General relativity still explains gravity - related evidence, so it's not replaced.
• Option B: Scientists constantly test theories, so this is incorrect.
• Option C: A theory's validity isn't based on fame, so this is wrong.
• Option D: Gravity's constancy over time isn't the reason the theory isn't replaced; the theory's explanatory power is key.

Answer:

A. It still explains the experimental evidence pertaining to gravity.