An image of several distant galaxies in space. They appear as small different coloured circles and ovals. An image of the galaxy GHZ2/GLASS-z12 is overlaid on the image. It appears orange in colour and is circular in shape.
The radio telescope array ALMA has pin-pointed the exact cosmic age of a distant JWST-identified galaxy, GHZ2/GLASS-z12, at 367 million years after the Big Bang. ALMA’s deep spectroscopic observations revealed a spectral emission line associated with ionized Oxygen near the galaxy, which has been shifted in its observed frequency due to the expansion of the Universe since the line was emitted. This observation confirms that the JWST is able to look out to record distances, and heralds a leap in our ability to understand the formation of the earliest galaxies in the Universe.
NASA / ESA / CSA / T. Treu, UCLA / NAOJ / T. Bakx, Nagoya U.