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Much depends on what else is found at the site. In archaeology, context is everything. A famous prehistoric site in Brooklin, Maine, yielded an 11th century silver Norse coin but it is believed to have landed there through trade and not as proof of Viking settlement.

Master shipbuilders and seafarers, warriors, traders and raiders, the Vikings boiled out of the Scandinavian fjords starting around the eighth century, marauding through Asia and the Middle East, North Africa and Europe. The Vikings focused particularly on the British Isles, and west to Iceland and Greenland, as memorialized in oral narratives and later recorded as the sagas by 13th century Icelandic monks.

Around 1000, Leif Ericson led an expedition to what became known as Vinland at the northernmost point of Newfoundland at L’Anse aux Meadows (the name an obscure corruption from the French) where explorers starting in 1960 discovered remnants of an extensive colony, including dwellings, a forge, and carpentry workshop — the Vikings’ first and so far only known landmark in the New World. They appear to have been routed by indigenous people the Norse called Skraeling.

One intriguing find was the seeds of a butternut tree, which did not grow that far north and hinted of travels to milder climates in the Gulf of St. Lawrence. But evidence of other Viking settlements has been lacking.

Parcak began her research by using a commercial satellite called WorldView-3, belonging to the company DigitalGlobe, to search known Norse sites on minuscule Papa Stour in the Shetland Islands of Scotland. Using the near-infrared spectrum invisible to the human eye, the satellite detected buried walls, and digging yielded a carnelian bead from India similar to those found at other Viking sites. Parcak then focused her satellite search on thousands of miles of coastline from the Canadian Arctic to New England.

After two weeks of digging at Point Rosee, an unexpected find in a flooded trench excited the explorers — several seeds, or perhaps blueberries, which were hurriedly sent for testing. The dates came back wildly off — 700 years after the Vikings, maybe even contemporary. They seem to have migrated on to the site much later.

“You feeling nervous, Sarah?” a NOVA reporter asked Parcak.

“No, I’m not,” she said.