First Pictures of Galaxies Formed After Big Bang

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NASA and US President Joe Biden have officially unveiled the first image of the distant universe taken from the James Webb Space Telescope. This is what NASA calls the “deepest and sharpest infrared image of the distant universe to date.” The US space agency will reveal more images later tonight. Here are quick five points to note and what else is expected.

Galaxy cluster SMACS 0723

This is the deepest, sharpest image of the distant universe showing the galaxy cluster SMACS 0723, according to the space agency. What is unique here is that “thousands of galaxies” have appeared in the telescope’s view, which is a first, according to NASA. The image shows the galaxy cluster SMACS 0723 as it appeared 4.6 billion years ago.

NASA notes in its press statement, “the combined mass of this galaxy cluster acts as a gravitational lens, magnifying much more distant galaxies behind it. Webb’s NIRCam has brought those distant galaxies into sharp focus – they have tiny, faint structures that have never been seen before, including star clusters and diffuse features.”

NASA’s James Webb Space Telescope has produced the deepest and sharpest infrared image of the distant universe to date. Known as Webb’s First Deep Field, this image of galaxy cluster SMACS 0723 is overflowing with detail. (Image credit: NASA, ESA, CSA, and STScI )

Size of a grain of sand

The image is another reminder of the vastness of the universe. According to NASA, “this slice of the vast universe covers a patch of sky approximately the size of a grain of sand held at arm’s length by someone on the ground.”

Taken from the Near-Infrared Camera (NIRCam)

The image was taken with the telescope’s Near-Infrared Camera (NIRCam). The image is combined using images taken at different wavelengths, a grand total of over 12.5 hours.

More images expected from NASA

NASA will release more first images from the James Webb Space Telescope. NASA has released a list of targets for which it will reveal full-colour scientific images. The list of images will include Carina Nebula, WASP-96 b (spectrum data), Southern Ring Nebula and Stephen’s Quintet. It has already revealed the image for SMACS 0723, which is a cluster of galaxies that distorts the light of objects behind it. NASA will host a livestream for this later tonight. It will start at 8.00 pm IST.

Other aspects of the universe that the James Webb Space telescope will help decode

The James Webb Space Telescope has a ​​primary mirror which is 6.5 metres in diameter, much much larger in size compared to previous telescopes. In comparison, the Hubble’s mirror was only 2.4 metres. This mirror–which is covered in gold as well– is what captures the light from the objects that the telescope is trying to observe. Read more about the mirrors here.

The telescope is also carrying a Near-Infrared Camera, Near-Infrared Spectrograph, Mid-Infrared Instrument, and Near-Infrared Imager and Slitless Spectrograph. It will use these instruments to hunt for the first light, the first galaxies, the assembly of galaxies, the birth of stars and other planetary systems as well.

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