On the moon‘s extreme western rim, straddling the border with the lunar far side, a landmark nearly 600 miles wide almost completely escapes Earth’s view.
A colossal asteroid-like invader once ripped through the lunar crust, flinging out rings of mountains and scooping out a giant bowl, later flooded and backfilled with dark lava. The bullseye still stands today, scars memorializing that long-ago catastrophe.
From space orbiter cameras, Mare Orientale, which means “Eastern Sea” in Latin, reads clearly as a fossil of violence, geometry, and time. But despite the lunar feature’s vastness, its location has forced it to remain one of humanity’s white whales.
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