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'Trillions' of Earths orbit red stars in older galaxies

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NoelBlakley
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MessagePosté le: 24/06/2018 08:28:50 Sujet du message: 'Trillions' of Earths orbit red stars in older galaxies Répondre en citant

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Astronomers say the Universe may contain three times the number of stars as is currently thought. Their assessment is based on new observations showing other galaxies may have very different structures to our Milky Way galaxy.The researchers tell the journal Nature that more stars probably means many more planets as well - perhaps "trillions" of Earth-like worlds.The Yale University-led study used the Keck telescope in Hawaii.“There are possibly trillions of Earths orbiting these stars”. Professor Pieter Van Dokkum Yale UniversityIt found that galaxies older than ours contain 20 times more red dwarf stars than more recent ones.Red dwarfs are smaller and dimmer than our own Sun; it is only recently that telescopes have been powerful enough to detect them.According to Yale's Professor Pieter van Dokkum, who led the research, the discovery also increases the estimate for the number of planets in the Universe and therefore greatly increases the likelihood of life existing elsewhere in the cosmos."There are possibly trillions of Earths orbiting these stars," he said. "Red dwarfs are typically more than 10 billion years old and so have been around long enough for complex life to evolve on planets around them. It's one reason why people
are interested in this type of star."The findings also help to account for what astronomers describe as the "missing mass" in the Universe.

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MessagePosté le: 24/06/2018 08:28:50 Sujet du message: Publicité

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