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Scientists have no idea what Dark Matter is.
Dec 11, 2005 Even though scientists have no idea what Dark matter really is, they're able to see its effect on regular matter, and use this data to build a map of where it's clustered. Astronomers have used the Hubble Space Telescope to map the Dark matter in two very young Galaxy clusters. Their observations lend evidence to the theory that Galaxies form at the densest regions of dark matter.
Dec 11, 2005 Two of Saturn's moons, Rhea and Dione posed for Cassini in this photograph. The lower Moon is Dione, which has been much more geologically active in the past than Rhea. Dione has a smoother surface and linear depressions, while Rhea looks quite pummeled by impacts, like our own Moon. When Cassini took this image, Rhea was 1.8 million kilometers (1.1 million miles) away, and Dione was 1.2 million kilometers (800,000 miles) away.
Dec 11, 2005 For more than 400 years, the Earth's magnetic North pole was in a roughly stable position, but now it's on the move, having drifted nearly 1,100 km (680 miles) in the last century. At this rate, it'll move out of Canada, and into Siberia in the next 50 years. If that happens, Alaska and Northern Canada may lose the beautiful Northern Lights, which are caused by the interaction of the magnetic pole and the solar wind. It could be that this is a normal oscillation of the magnetic pole, or it might be that the Earth's magnetic poles are getting ready to flip.
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