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New image shows 200 mile-long liquid river on Titan Evan AckermanWednesday, December 12, 2012 Planetary scientists have suspected for quite a while that Titan, one of Saturn's moons, has a 'methane cycle' that's much like the water cycle we have here on Earth. New pictures from Cassini suggests that the similarity between Titan and Earth may be even more pronounced, as astronomers have identified a huge, Earth-like river system full of liquid methane.

New image shows 200 mile-long liquid river on Titan Evan AckermanWednesday, December 12, 2012 Planetary scientists have suspected for quite a while that Titan, one of Saturn's moons, has a 'methane cycle' that's much like the water cycle we have here on Earth. New pictures from Cassini suggests that the similarity between Titan and Earth may be even more pronounced, as astronomers have identified a huge, Earth-like river system full of liquid methane.

A false-color image from NASA's Cassini spacecraft depicting Saturn's moon Titan in ultraviolet and infrared wavelengths.

Venus is the brightest planet in our solar system, has a hellish atmosphere, and is covered in volcanoes. Learn more about planet Venus here.

Astronomy Photographer of the Year 2012 nominations – in pictures

The Elephant's Trunk in the constellation of Cepheus. Photograph: Bill Snyder/Royal Observatory

The giant orange moon Titan — larger than the planet Mercury — can be seen at upper right. The white icy moons that are much closer to Saturn, hence much closer to the ring plane in this view, are, from left to right: Enceladus, Dione, and Mimas. The dark band running across the face of the planet slightly above the rings is the shadow of the rings cast on the planet

Like the sun, Jupiter is composed predominantly of hydrogen & helium. But unlike the sun, it lacks the necessary amount to begin fusion, the process that fuels a star. Jupiter would need to be 75-80 times more massive than it is at present to be considered a star. If all of the planets in the solar system had formed as part of the gas giant, it still would not have sufficient mass. Still, by itself, Jupiter is 2 & 1/2 times larger than all of the other planets in the solar system combined.

Saturn’s south polar vortex- A monstrous vortex sits at Saturn’s south pole. It’s not just beautiful. It also lets astronomers peer deep into Saturn’s dense atmosphere: NASA/JPL/Space Science Institute

Hubble Peers at Earth-Size Planets' Atmospheres

The two potentially habitable exoplanets both seem to have dense, compact blankets of gas like those around Earth or Venus.