I agree with you as regards the present tense being used, as it is a scientific idea.
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vsuresh Here, though the past simple tenseThat's right.seems towould be consistent with the main clause, thesimplepresent simple sounds OK too asthey denoteit's being used to describe a scientific fact.idea.
teechrvsuresh Here, though the past simple tense seems to would be consistent with the main clause, the simple present simple sounds OK too as they denote it's being used to describe a scientific fact. idea.Thank you very much,teechr.
vsuresh simple present sounds OKYes, it's a kind of time-independent axiom such as: