NASA Webb Explores Family Tree of Newly Discovered Distant Objects

Since NASA's James Webb Space Telescope discovered them in 2022, astronomers have been puzzled by 'little red dots'—compact red objects scattered throughout the early universe, abundant in the cosmic past but increasingly rare as the universe ages. Per NASA News, a new study published July 29 proposes they're not a unique galaxy type, but a temporary phase of highly active supermassive black holes. The team analyzed a nearby galaxy nicknamed the Saguaro, which displays a little red dot-like center and reveals what these objects truly look like up close: a brilliantly active black hole surrounded by a fainter host galaxy. What appears as an isolated dot at extreme distances is actually this complete system, but the surrounding galaxy simply fades from view across billions of light-years—an observational bias that has shaped how astronomers perceive these distant objects.

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