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    Home»Science»New signs found of giant gas planet in ‘Earth’s neighbourhood’
    Science

    New signs found of giant gas planet in ‘Earth’s neighbourhood’

    By Emma ReynoldsAugust 8, 2025No Comments3 Mins Read
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    New signs found of giant gas planet in 'Earth's neighbourhood'
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    Georgina Rannard

    Science correspondent

    NASA, ESA, CSA, STScI, R. Hurt (Caltech/IPAC) This artist’s concept shows what a gas giant orbiting Alpha Centauri A could look like. In this concept, Alpha Centauri A is depicted at the upper left of the planet, while the other Sun-like star in the system, Alpha Centauri B, is at the upper right. Our Sun is shown as a small dot of light between those two stars.NASA, ESA, CSA, STScI, R. Hurt (Caltech/IPAC)

    An artist’s drawing of what the new planet might look like. Our Sun is the small dot of light between the two bright stars on the left and right.

    Scientists have found strong evidence of a giant gas planet in the nearest star system to our own.

    At four-and-a-half light years away, the lifeless planet would be a close neighbour to Earth in astronomical terms and could have moons that sustain life.

    The signs were found in the star system Alpha Centauri by the powerful James Webb Space Telescope.

    The potential planet was detected last year, but it had disappeared in follow-up observations. Astronomers must now look again to prove it definitely exists.

    Scientists are particularly excited about this discovery because of the similarities between the exoplanet’s star and our Sun.

    “Four years is a long way but in galaxy terms, it’s very close – it’s in our neighbourhood,” said Dr Carly Howett, associate professor of space instrumentation at the University of Oxford.

    “It is around a star that is Sun-like and about the same temperature and brightness. That’s really important if we want to think about habitable worlds,” she added.

    The planet would be similar to our solar system’s gas giants, Saturn and Jupiter, and would be enveloped in a thick gas cloud.

    That means it could not support life itself, but it could have moons that are habitable.

    Jupiter and some other planets in our solar system have icy moons, which researchers believe could support life.

    Scientists are currently investigating that possibility on missions called Europa Clipper and Juice.

    But those planets are far away from our life-giving Sun. The potential “new” planet is comparatively close to its star.

    Getty Images Stock illustration of Jupiter's large moon, Europa, covered by a thick crust of ice above a vast ocean of liquid water Getty Images

    An illustration of Jupiter’s moon Europa where scientists think there could be signs of life in its ocean

    The signs were found in direct imaging by the James Webb Space Telescope, which is the closest thing scientists have to taking photographs of distant objects.

    “These are incredibly challenging observations to make, even with the world’s most powerful space telescope, because these stars are so bright, close, and move across the sky quickly,” said Charles Beichman from Nasa’s Jet Propulsion Laboratory and co-first author of the new discoveries.

    Those stars create huge amounts of bright light that can block out nearby objects.

    That could be why the planet was detected once, in August 2024, but then seemingly disappeared when scientists looked for it again.

    “Probably the planet was either behind the star or too close to be able to see it. You need an element of luck,” said Dr Howett.

    Astronomers will now look for more signs of the planet. They hope to use a new Nasa telescope – the Grace Roman Space Telescope – which is due to start operating in 2027.

    Future observations by the James Webb Space Telescope should also be able to tell us what the planet is made up of, using something called spectral imaging.

    That will build up a more detailed picture of what it looks like, and how habitable any orbiting Moons could be.

    Earths gas giant neighbourhood planet signs
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    Emma Reynolds is a senior journalist at Mirror Brief, covering world affairs, politics, and cultural trends for over eight years. She is passionate about unbiased reporting and delivering in-depth stories that matter.

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