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Radio Telescope found something unusual.
Researchers using the National Science Foundation's Very Long Baseline Array (VLBA) radio telescope found something unusual about the jet of material streaming away from a powerful quasar that may leave theorists scratching their heads. Quasars are thought to be jets blasting away from supermassive black holes at the hearts of distant galaxies. The team was expecting magnetic forces to twist the jet and keep material aligned in the middle, but they found just the opposite; the jet is scattered in the centre and more aligned at its edges.
By studying data gathered by NASA's Galileo spacecraft, researchers have come to the conclusion that Amalthea, one of Jupiter's moons, is probably just a jumble of icy rubble, held together by gravity. scientists originally believed it was made of rock, but Galileo helped to discover that its density is actually lower than water. It probably formed further out in the solar system, but was then captured into a stable orbit by Jupiter's immense gravity.
The European Space Agency's Mars Express spacecraft took this image of an ancient outflow channel in the Ares Vallis region of Mars. This immense channel is 1400 km (870 miles) long, and eventually empties into Chryse Planitia; where the Mars Pathfinder mission landed in 1997. The bumpy "islands" are individual blocks of rocks and hills that were harder for the rushing water to weather down, so they remain in the channel.
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