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A tiny shift exposes a cold brown dwarf masquerading as an early galaxy

Summary by Phys.org
A faint red object spotted by the James Webb Space Telescope originally appeared to offer a possible glimpse of the universe's first galaxies. But images taken about 3½ years apart revealed a giveaway: The object, nicknamed Capotauro, had moved.

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Cosmic doppelganger: A reddish light point in the field of view of the James-Webb telescope was considered a possible galaxy from the earliest time of the universe. However, new images show that the "Capotauro" christened object moved relative to the background. The measurement exposes the supposed galaxy candidate as an extremely cool brown dwarf in our Milky Way. Edinburgh (Scotland). The James-Webb space telescope looks up until [...] The pos…

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Phys.org broke the news in Douglas, United Kingdom on Tuesday, November 3, 2026.
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