NASA explains photos of almost perfectly rectangular iceberg

NASA explains photos of almost perfectly rectangular iceberg

NASA explains photos of almost perfectly rectangular iceberg

The weird block of floating ice has nearly perfectly straight edge making the naturally formed iceberg look uncannily man-made. But alien conspiracy fans will be disappointed to learn that it's a naturally occurring phenomenon. Not all of them are rectangular-some have jagged borders like a puzzle piece, but most of their sides are sheer and smooth (at least at first).

NASA also posted an image of another geometric iceberg, but in the shape of a triangle.

However, tabular icebergs are enormous slabs of ice with a flat top and vertical sides that form by "calving" or splintering off a much larger ice shelf.

Such objects are not unknown, however, and even have a name - tabular icebergs. At that point, tides or strong winds could break icebergs off.

Just remember though, next time you see a weirdly rectangular iceberg, your eyes do not deceive you.

The tweet explained the iceberg can be seen "floating among sea ice just off of the Larsen C ice shelf".

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Simply put, many ice shelves, particularly in West Antarctica, are losing ice faster than they can be replenished.

Seen from space, this particular iceberg has a rich diversity of sharp-edged friends - and although it initially seemed perfectly rectangular, it's not.

Straight, geometric lines aren't uncommon in tabular icebergs, which tend to break along natural cracks and crevasses in the ice, a process accelerated by warmer temperatures as meltwater trickles into and widens the cracks.

Since the iceberg has sharp angles and a flat surface, NASA suggests it came from a calving event that occurred recently.

Categorized as a tabular iceberg, the square-like iceberg was estimated to be over a mile across.

But this is the first year that the scientists will also survey Antarctica using the new Ice, Cloud and land Elevation Satellite-2. A very basic imagery that we all have of an iceberg is an angular one with a small tip at the top of the water.

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