What the Heck Is This?

If you guessed it's from an episode of "The Hole in the Wall," your experiencing an optical illusion.

While the image might seem to show a hole, it actually shows a lagoon within an atoll surrounded by an ocean, all viewed from space. The photo was taken by astronauts on the International Space Station.

Bassas da India is an uninhabited atoll in the Indian Ocean. It's made of volcanic rock surrounded by coral reefs, all 6 miles (10 kilometers) in diameter.

Sunlight glinting off the water is what creates the very unusual appearance.  Darker patches and streaks are caused by currents in the water.

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Image Credit: NASA