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Infrared Views Of Two Of Saturn's Moons Reveal 'Pac-Man' Features

For the second time in two years, Cassini has spotted a Pac-Man-like feature on one of Saturn's moons.

As NASA puts it, it is a veritable "gamers' paradise." Just take a look:

What you're seeing there is the infrared image taken of the moon Mimas in 2010 and the other is of the moon Tethys taken this year. The red and yellow areas show the warmest places on the moon.

"Finding a second Pac-Man in the Saturn system tells us that the processes creating these Pac-Men are more widespread than previously thought," said Carly Howett, the lead author of a paper explaining the findings, which was published in the journal Icarus.

As NASA writes in a press release, it's an odd shape, but scientists think they know how it came to be.

NASA reports:

"Scientists theorize that the Pac-Man thermal shape on the Saturnian moons occurs because of the way high-energy electrons bombard low latitudes on the side of the moon that faces forward as it orbits around Saturn. The bombardment turns that part of the fluffy surface into hard-packed ice. As a result, the altered surface does not heat as rapidly in the sunshine or cool down as quickly at night as the rest of the surface, similar to how a boardwalk at the beach feels cooler during the day but warmer at night than the nearby sand. Finding another Pac-Man on Tethys confirms that high-energy electrons can dramatically alter the surface of an icy moon. Also, because the altered region on Tethys, unlike on Mimas, is also bombarded by icy particles from Enceladus' plumes, it implies the surface alteration is occurring more quickly than its recoating by plume particles."

Copyright 2012 National Public Radio. To see more, visit http://www.npr.org/.

NPR

A Compelling Plot Gives Way To Farce In Franzen's Purity

The new novel reveals sharp observations and a great, sprawling story. But critic Roxane Gay says the book gets bogged down with absurdly-drawn characters and misfired critiques of modern life.
NPR

Huge Fish Farm Planned Near San Diego Aims To Fix Seafood Imbalance

The aquaculture project would be the same size as New York's Central Park and produce 11 million pounds of yellowtail and sea bass each year. But some people see it as an aquatic "factory farm."
WAMU 88.5

Europe's Ongoing Migrant And Refugee Crisis And The Future Of Open Borders

The Austria-Hungary border has become the latest pressure point in Europe's ongoing migrant crisis. An update on the huge influx of migrants and refugees from the Middle East and Africa and the future of open borders within the E.U.

WAMU 88.5

Environmental Outlook: How to Build Smarter Transportation And More Livable Cities

A new report says the traffic in the U.S. is the worst it has been in years. Yet, some urban transportation experts say there's reason to be optimistic. They point to revitalized city centers, emerging technology and the investment in alternative methods of transportation. A conversation about how we get around today, and might get around tomorrow.

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