Astronomers have used JWST to weigh a galaxy in the early Universe, finding that it has roughly the same mass as the Milky Way should have had at the same time in the Universe's history. The galaxy was seen in a gravitational lens and contains a collection of star clusters, so astronomers have nicknamed it the "Firefly Sparkle Galaxy." The galaxy also contains companion dwarf galaxies, similar to the Milky Way's Magellanic Clouds, which probably merged with it.


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Source: Webb Weighs an Early Twin of the Milky Way