Astronomers

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Thousands of exoplanets orbiting stars have been discovered but few are the Earth’s size. File photograph: Getty Images

Astronomers have discovered a nearby star that has seven Earth-sized planets in orbit around it. At least six of them match Earth’s temperature, rais(...)

Mike Brown, professor of planetary astronomy, points to the gold ring showing the orbital path of Planet Nine at Caltec in California. Photograph: Patrick T Fallon via Getty Images

Astronomers were shocked last January when a research team floated the possibility that there might be an as yet undiscovered large planet lurking fa(...)

A small statue of Albert Einstein is seen at the Einstein Archives of the Hebrew University as they present the original 100 years old documents of Einstein’s prediction of the existence of gravitational waves. Photograph: Abir Sultan/EPA

Scientists have for the first time detected gravitational waves, ripples in space and time hypothesised by physicist Albert Einstein a century ago. (...)

Wren boys in Dublin. Photograph: Frank Miller

People look to the skies at Christmas, some watching for a Yuletide star pointing the way and others for flying reindeer and a jolly character dres(...)