The picture was taken last week by scientists on a Nasa research plane.
The iceberg's unique geometric shape sparked considerable debate on social media that it was formed by - you guessed it - space aliens.
But that's exactly what NASA captured in an image posted on Twitter of an iceberg in what appears to be the shape of a ideal rectangle.
NASA photographed this tabular iceberg that split from the Larsen C ice shelf on the Antarctic Peninsula.
Unlike the icebergs of non-tabular variety, such as the irregularly shaped berg that sunk the Titanic, these chunks of ice are distinguished by their flat tops, steep sides, and sometimes massive sizes.
"The iceberg's sharp angles and flat surface indicate that it probably recently calved from the ice shelf", the team writes.
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She said there were two types of iceberg.
Tabular icebergs are the remnants of calving events, where a large strip of ice breaks free from an ice shelf.
Speaking to LiveScience, University of Maryland Earth scientist Kelly Brunt compared calving events to a long fingernail that eventually snaps off at the end; the process often results in seemingly ideal geometric edges.
"What makes this one a bit unusual is that it looks nearly like a square", she told the LiveScience website.
"Triangular iceberg surrounded by many different types of sea ice, off the Larsen ice shelf in the Weddell Sea", NASA said. The berg is estimated to be more than one mile across and, like all icebergs, just 10 percent of its mass is visible above the surface.
"In the open water, grease ice is forming".