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The ringed Planet Saturn has some of the most turbulent weather.
New research from the University of Michigan has determined that there's definitely an upper limit to the mass that stars can reach - between 120 and 200 times the mass of our own Sun. The team examined a wide range of stellar clusters, and determined the distribution of the mass of stars in those clusters. They couldn't find any stars above this 120-200 stellar mass limit. But this brings up a new mystery. Is this as big as stars get because they run out of material, or is there a fundamental limit in physics that stops them from getting any bigger?
The ringed planet Saturn has some of the most turbulent weather in the Solar System, including a powerful polar vortex at its southern pole. But new observations by the giant Keck 1 telescope in Hawaii have turned up a mystery. Unlike the other planets with polar vortexes, which are generally much colder than the surrounding atmosphere, Saturn's is warmer - in fact, it's the warmest place on the planet. One theory is that particles in Saturn's atmosphere, which could warm the planet through a greenhouse effect, have been concentrated by winds down to the south pole.
NASA's Cassini spacecraft took this natural colour image of Saturn's Moon Rhea. It seems to display bright, wispy terrain, which looks like it's just been painted onto its surface - this is similar to another of Saturn's moons, Dione. Images were taken using Cassini's red, blue and green spectral filters, and then combined to create the natural colour version. They were taken on January 16, 2005, when Cassini was 496,500 kilometers (308,600 miles) from Rhea.
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