Scientists said it was an "unexpected" discovery: There's a liquid methane filled lake near the equator of Saturn's moon Titan.
Scientists had seen lakes on Titan before, but they didn't expect them near the equator because they believed the intensity of the sun at those latitudes would evaporate the liquid.
"This discovery was completely unexpected because lakes are not stable at tropical latitudes," planetary scientist Caitlin Griffith of the University of Arizona, who led the discovery team, told the AP.
It's ALL THINGS CONSIDERED, from NPR News. I'm Audie Cornish.
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And I'm Melissa Block. There's news today that the U.S. Anti-Doping Agency, or USADA, has brought formal doping charges against seven-time Tour de France winner Lance Armstrong. USADA is the body that fights performance-enhancing drug use in Olympic sports.