![]() The new technique, called Median Radon Transform, examines every linear path across an image at every possible angle. Occasionally, a pesky nearby Milky Way star might get in the way of one’s view of a faraway object. It’s standard procedure for astronomers to try to clean images of “artifacts,” like the effects of cosmic rays hitting Hubble’s camera detectors, or diffraction spikes, which make bright stars look like crosses. “It’s particularly good at finding satellite trails that can be missed by eye,” he said. But Stark was presenting his team’s idea for a Band-Aid fix: new software they described in a recent report that is five to 10 times more sensitive at finding trails than previous software, and then masking them out. In fact, he said, his team used a new detection method to measure that the rate of satellite trails is doubling. ![]() Appropriately, the proposal for observing time was named "They almost got away"! Astronomers took advantage of occasional gaps in Hubble's busy schedule to capture images of these barely-explored galaxy clusters, revealing a wealth of interesting targets for further study with Hubble and the NASA/ESA/CSA James Webb Space Telescope.“We see these satellite trails in Hubble data, and really in all astronomical data, and they’re a bit of a nuisance,” said David Stark, an astronomer at the Space Telescope Science Institute in Baltimore, speaking last week at the American Astronomical Society conference in Albuquerque, New Mexico. This is one of a series of Hubble observations searching for massive, luminous galaxy clusters that had not been captured by earlier surveys. ![]() This collection of astronomical curiosities is the galaxy cluster ACO S520 in the constellation Pictor, which was captured by Hubble’s Advanced Camera for Surveys. A pair of bright stars are also visible at the left of this image, notable for their colourful criss-crossing diffraction spikes. As well as several large elliptical galaxies, a ring-shaped galaxy is lurking on the right of this image. Hubble recently completed a deep dive into jellyfish clusters, specifically …Ģ4 April 2023: A menagerie of interesting astronomical finds fill this image from the NASA/ESA Hubble Space Telescope. Unlike their ocean-dwelling namesakes, jellyfish galaxies make their homes in galaxy clusters, and the pressure of the tenuous superheated plasma that permeates these galaxy clusters is what draws out the jellyfish galaxies’ distinctive tendrils. These bright tendrils contain clumps of star formation and give jellyfish galaxies a particularly striking appearance. Jellyfish galaxies get their unusual name from the tendrils of star-forming gas and dust that trail behind them, just like the tentacles of a jellyfish. A handful of more distant galaxies are lurking throughout the scene, and a bright four-pointed star lies to the lower right side. This galaxy lies over 650 million light-years from Earth in the appropriately-named constellation Telescopium, and was captured in crystal-clear detail by Hubble’s Wide Field Camera 3. : The jellyfish galaxy JO175 appears to hang suspended in this image from the NASA/ESA Hubble Space Telescope. ![]()
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