Webb telescope promises new age of the stars

    The James Webb Space Telescope lit up 2022 with dazzling images of the early universe after the Big Bang, heralding a new era of astronomy and untold revelations about the cosmos in years to come.

    By: AFP
    | Updated on: Dec 29 2022, 08:07 IST
    AMAZING image of Earendel star captured by NASA's James Webb Space Telescope
    James Webb Space Telescope
    1/5 http://tech.hindustantimes.com/tech/news/nasa-james-webb-space-telescope-captures-the-image-of-the-most-distant-star-in-the-universe-named-earendel-71659511630090.html (NASA)
    2/5 The image was tweeted on August 2 by a group of astronomers who post images from the James Webb Space Telescope through the Cosmic Spring JWST Twitter account. The image was captioned, “We're excited to share the first JWST image of Earendel, the most distant star known in our universe, lensed and magnified by a massive galaxy cluster. It was observed Saturday by JWST program 2282”. (AP)
    Earendel - the most distant star in the Universe ever seen
    3/5 The Earendel star was discovered earlier this year by the old Hubble Space Telescope. Although it managed to capture the star, the image was not as clear as the one taken by James Webb Telescope. (NASA)
    4/5 In comparison, its successor, James Webb Space Telescope captured the image which showed the faint red glow of the Earendel star and the starry trail on which it lies. The star is seen as a tiny red speck at the lower right side of the image. (NASA)
    James Webb Space Telescope
    5/5 To capture these distant objects in detail, astronomers use Gravitational lensing. Celestial objects such as stars and galaxies bend light emitting from the objects behind them due to its gravitational fields. When this light from farther stars passes through these massive celestial objects, it acts like it is passing through the lens of a telescope and becomes magnified. This enables astronomers to capture them in extreme detail. (NASA)
    James Webb Space Telescope
    View all Images
    The NASA James Webb Space Telescope surpasses scientists' expectations (NASA)

    The James Webb Space Telescope lit up 2022 with dazzling images of the early universe after the Big Bang, heralding a new era of astronomy and untold revelations about the cosmos in years to come.

    The most powerful observatory sent into space succeeded the Hubble telescope, which is still operating, and began transmitting its first cosmic images in July.

    "It essentially behaves better than expected in almost every area," said Massimo Stiavelli, head of the Webb mission office at the Space Telescope Science Institute, in Baltimore.

    Already scientists say the Webb telescope, now orbiting the sun at a million miles (1.6 million kilometres) from Earth, should last 20 years, twice its guaranteed lifetime.

    "The instruments are more efficient, the optics are sharper and more stable. We have more fuel and we use less fuel," said Stiavelli.

    Stability is vital for image clarity.

    "Our requirement was similar to that of Hubble, in terms of pointing accuracy. And we ended up being seven times better," the mission office chief added.

    Public appetite for the discoveries has been fed by the colouring of the telescope's images.

    Light from the most distant galaxies has been stretched from the visible spectrum, viewable by the naked eye, to infrared -- which Webb is equipped to observe with unprecedented resolution.

    This enables the telescope to detect the faintest glimmers from the distant universe at an unprecedented resolution, to see through the veil of dust that masks the emergence of stars in a nebula and to analyse the atmosphere of exoplanets, which orbit stars outside our solar system.

    - 18 petals -

    "The first year (of observation) is a way to test out the tool for the small rocky planets in the habitable zone that could potentially be like Earth," said Lisa Kaltenegger, associate professor in Astronomy at Cornell University.

    "And the tests are beautiful. They're spectacular."

    Webb blasted off aboard an Ariane 5 rocket at the end of 2021, crowning a 30-year project at the US space agency NASA.

    It took 10,000 people and $10 billion to put the 6.2-tonne observatory into space.

    En route to final orbit, Webb deployed a five-layer sunshield the size of a tennis court followed by a 6.5-metre primary mirror made up of 18 hexagonal, gold-coated segments or petals.

    Once calibrated to less than a millionth of a metre, the 18 petals began to collect the light-pulsing stars.

    On July 12, the first images underlined Webb's capabilities unveiling thousands of galaxies, some dating back close to the birth of the Universe, and a star nursery in the Carina nebula.

    Jupiter has been captured in incredible detail which is expected to help understand the workings of the giant gas planet.

    - More to be revealed -

    The blue, orange and grey tones of the images from the "Pillars of Creation", giant dust columns where stars are born, proved captivating.

    Scientists saw the revelations as a way of rethinking their models of star formation.

    Researchers using the new observatory have found the furthest galaxies ever observed, one of which existed just 350 million years after the Big Bang some 13.8 billion years ago.

    The galaxies appear with extreme luminosity and may have started forming 100 million years earlier than theories predicted.

    "In the distant Universe, we have an excess of galaxies compared to models," David Elbaz, scientific director for astrophysics at France's Alternative Energies and Atomic Energy Commission, told AFP.

    Another surprise has been that where Hubble essentially observed irregular shaped galaxies, the precision of the Webb telescope produces magnificent spiral galaxies similar to our own.

    This has led to musings over a potential universal model which could be one of the keys to star formation.

    Webb also opened up a profusion of clusters of millions of stars, which could be the potential missing link between the first stars and the first galaxies.

    In the field of exoplanets, Webb honed in on a faraway gas giant called WASP-96 b.

    Nearly 1,150 light years from Earth, WASP-96 b is about half the mass of Jupiter and zips around its star in just 3.4 days.

    Webb also provided the first confirmation that carbon dioxide is present in the atmosphere of another exoplanet WASP 39-b.

    But for Stiavelli, "some of the big things either haven't been observed yet, or haven't been revealed yet".

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    First Published Date: 29 Dec, 08:06 IST
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