Determining the Age of Ancient Galaxies #SpaceSaturday

A mystery that began with a radio signal that has been traveling since almost the beginning of the universe has led astronomers on a journey of discovery that led to some of the most distant galaxies ever discovered. Here’s more from Phys.Org:

The galaxy, named GHZ2/GLASS-z12, was initially identified in the JWST GLASS survey, a survey that observes the distant universe and behind massive clusters of galaxies. These observations consist of several images using different broad-band color filters, similar to the separate RGB colors in a camera. For distant galaxies, the light takes such a long time to reach us that the expansion of the universe has shifted the color of this light towards the red end of the visible light spectrum in the so-called redshift. The red color of GHZ2/GLASS-z12 consequently helped researchers identify it as one of the most convincing candidates for a distant galaxy they observed.

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