Strange Milky Way planetary system leaves scientists puzzled - Reuters

Using the NASA’s James Webb Space Telescope, a team of researchers led by University of Minnesota astrophysicist Mason Huberty had a closer look at a group of almost 10,000 galaxies spanning billions of light-years in the Fornax constellation. As detailed in a new paper published in The Astrophysical Journal, they honed in on a small space in the region that they thought was entirely unoccupied. But to their astonishment, they observed a single emission line emanating from it — twice over a span of just three months. Emission lines are bright, narrow bands of light emitted at a specific wavelength by distant celestial objects and other phenomena. Puzzlingly, prior observations from the same region didn’t feature the same reading.

A new supercomputer simulation traces how thousands of small galaxies eventually became the Milky Way.