The celestial objects were unknown until a little more than 60 years ago, but even the name is now part of our lexicon.
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Space telescopes track quasar SDSS J0005+2007 as its X-rays резко fade
Four space telescopes have watched a quasar lose more than 90 percent of its X-ray brightness in roughly five years, while its visible light and infrared glow barely budged. The object, cataloged as ...
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