" The main verb is is . Either the first comma should be deleted or another should be added: The fact that we live at the bottom of a deep gravity well, on the surface of a gas-covered planet going around a nuclear fireball 90 million miles away , and think this to be normal is obviously some indication of how skewed our perspective tends to be. Actually, I think the sentence is better without them.
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moon7296Q) Is the main verb for the subject, the fact, "covered?"The main verb is is.