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This is Scientific American 60-Second Science. I'm Clara Moskowitz. Got a minute?

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The universe is a dark, cold place.

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But it has a strange region that's even colder than usual.

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Seen from Earth, it's an area where the ambient cosmic microwave background light, the leftover thermal energy of the big bang is much chillier than expected.

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Now astronomers say they've found in the same part of space a so-called supervoid, a large area mostly empty of galaxies.

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And they think the overlap is no coincidence.

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The supervoid extends 1.8 billion light-years across, making it perhaps the largest structure known in the cosmos, according to a report in the Monthly Notices of the Royal Astronomical Society.

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The supervoid's relative lack of stuff could have drained energy from light that passed through it, explaining why the microwave background is colder there.

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Here's how it works:

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General relativity tells us that gravity bends spacetime, causing light to travel a curved path near massive objects, as if falling into a bowl.

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The supervoid, then, with its lack of mass, is akin to a hill.

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When light travels up that hill, it loses energy.

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Normally it would regain the energy upon exiting the void—that is, when it comes down the other side of the hill.

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But because the expansion of space is accelerating, the hill the light tumbles down is less steep than it was when the light climbed up.

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And the flatter ride down means less energy recovered than was expended going up.

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Which translates to a low-energy region, a big chill in the remnant of the Big Bang.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Clara Moskowitz.

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