They're usually formed when breaking off from ice shelves; in this case, it likely came from the deteriorating Larsen C-the same shelf that saw a 2,200 square-mile, trillion-ton iceberg break away a year ago.
Others simply posted photos of other majestic tabular icebergs.
During the survey, created to assess changes in the ice height of several glaciers draining into the Larsen A, B and C embayments, IceBridge scientist Jeremy Harbeck spotted a very sharp-angled, tabular iceberg floating among sea ice just off of the Larsen C ice shelf.
Why?: Kelly Brunt, an ice scientists from NASA, told Live Science there's a reason for the iceberg appearing like a ideal rectangle.
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Ice scientist Kelly Brunt explained to Live Science that tabular icebergs are fairly common. Operation IceBridge is a research initiative created to better understand how the poles influence Earth's climate, and it uses a fleet of research planes to regularly collect information.
Operation IceBridge is the Nasa's longest-running aerial survey of polar ice which is created to assess changes in the ice height of several glaciers.
Although it's often said that there are no straight lines or ideal 90-degree angles in nature, they do happen, albeit rarely. And the portion above the surface is likely just 10 percent of the total iceberg, Petty says. "You can just get these fracture lines that can form these interesting geometric structures", he says, and points out a different, triangle-shaped iceberg spotted by NASA scientists recently. At that point, tides or strong winds could break icebergs off.
That was not the only shape that scientists spotted last Wednesday. "Scientists can then calculate the distance between the aircraft or the satellite and the ice surface, which gives them the ice height".