Gravity isn’t particularly controversial these days, no. Many things that aren’t now, though—like the curvature of earth, or heliocentricity—once were; that a topic is controversial doesn’t mean there’s no right answer.

And I would agree that political science is largely concerned with philosophy, but let’s not mistake any old politicized belief as fitting under the umbrella of “political science”: that e.g. a manual recount renders any conspiracies about an automatic ballot-counting machine irrelevant to a final vote tally is a matter of common sense, not profound debate—and yet this has proved a controversial point these last few weeks.