NASA James Webb Space Telescope shows galaxies date back to 400 million years after the Big Bang

tech.hindustantimes.com:

NASA's James Webb Space Telescope is playing its role in decoding and revealing the secrets of the universe. The Webb telescope has now captured the images of galaxies that formed less than 400 million years after the big bang. Informing about the same NASA Webb Telescope tweeted. "Preliminary Webb science shows galaxies confirmed by spectroscopy to date back to less than 400 million years after the big bang. Finding and confirming early galaxies is a continuous process, and Webb is just getting started."

"An international team of astronomers has used data from NASA's James Webb Space Telescope to report the discovery of the earliest galaxies confirmed to date. The light from these galaxies has taken more than 13.4 billion years to reach us, as these galaxies date back to less than 400 million years after the big bang, when the universe was only 2% of its current age," NASA informed.

In a series of tweets NASA Webb Telescope further informed that spectroscopy is needed to confirm how far away a galaxy is, as closer galaxies can 'masquerade' as distant ones. "Spectroscopy refers to breaking light into its components to create spectra, or “barcodes.” On a "barcode," elements and molecules have distinct signatures we can read," it said.

Because the universe is expanding, the light from distant galaxies is stretched — or redshifted — into longer, infrared wavelengths. We can figure out galaxies' distances by measuring how much the signatures of elements in their spectra have shifted due to this effect. To search for the earliest galaxies, scientists looked for a distinct feature in spectra that required Webb's unprecedented infrared sensitivity to observe, the space research organisation informed.

Earlier data from Webb had