New photos from NASA's Cassini spacecraft are giving researchers clues to the weather cycle of Titan, one of Saturn's moons. By studying previous images, scientists think Titan has a hydrologic cycle, in which hydrocarbons rain onto the surface filling the lakes and then evaporating back into the atmosphere. The new photos have shown another aspect of that cycle. "Many of these northern liquid bodies are surrounded by a bright material not seen elsewhere on Titan," said Carolyn Porco, who leads the Cassini imaging team. "Is this an indication that with increased warmth, the seas and lakes are starting to evaporate, leaving behind a deposit of organic material?"