Really?

From time to time articles like this appear in the Washington Post or the New York Times with casually definitive statements like this:

Earth, along with the other planets in our solar system, formed about 4.5 billion years ago from a cloud of dust and gas swirling around the embryonic sun. For hundreds of millions of years, ours was a harsh, molten world, heavily bombarded by debris. At one point, a Mars-sized object slammed into the Earth and blasted into space the material that eventually cohered into the moon.

…as if none of it could possibly be questioned.

What if it can be?

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