That scientist found that the Earth revolves around the Sun. This is referring to the time in the past - 'found' - when this 'timeless' truth - "the Earth revolves around the Sun" - was first discovered. That scientist found that the Earth revolved around the sun.
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TakaThat scientist found that the earth revolves around the sun.The earth revolves around the sun is a statement that we accept as true. It is used as an object in the sentence as a "universal truth."
TakaDoes that mean if it is the truth, itNo! It is always correct to backshift.havehas to be the present?
TakaHow does this sound?That scientist found that the earth revolved around the sun.It sounds lovely. Don't worry. Both versions are fine.