Good morning America! You all seem thrilled about Biden’s moon rock. Its symbolism, of the scientific and exploratory achievements that have been made – and will ideally soon be surpassed – certainly hits home.

What you might not know is that rock has an *epic* backstory. 1/x

This rock is known as Lunar Sample 76015,143 - an unromantic name for one of the geologic treasures brought back from the Moon during the Apollo era. This was scooped up by the Apollo 17 astronauts, including Harrison Schmitt, the only professional geologist sent to the moon. 2/x

But that’s not where our story begins. The rock's sage starts 4.5 billion years earlier.

I don’t know if you know this, but you should: the Moon is a hole-punched volcanic crypt, a place sculpted by huge impacts and strange, epic effusions of lava. 3/x

We don’t know how the Moon formed. But the leading theory, partly because it’s the simplest, is that a Mars-sized protoplanet slammed into a magma ocean-covered baby Earth. The impact debris formed an orbiting disk, and it clumped together. Et voilà. 4/x

A whole bunch of cool stuff happened after that. But our moon rock comes into the picture around 600 million years later, around the time giant space rocks were pelting the Moon, Marco Inaros-style. They left some epic scars, mostly on the nearside for some unknown reason. 5/x