All posts tagged: spheres

Dozens of stars show signs of Dyson spheres built by advanced alien civilisations

Dozens of stars show signs of Dyson spheres built by advanced alien civilisations

Dyson spheres could capture the energy from a star dotted zebra/Alamy Two surveys of millions of stars in our galaxy have revealed mysterious spikes in infrared heat coming from dozens of them. Astronomers say this could be evidence for alien civilisations harnessing energy from their stars by using a vast construction known as a Dyson sphere – although they can’t fully rule out more mundane explanations. First proposed in the 1960s, Dyson spheres are hypothesised structures that could surround entire stars to absorb their energy, a possible means by which advanced aliens might… Source link

Music of the spheres: astronomers detect ‘cosmic bass note’ of gravitational waves | Astronomy

Astronomers have detected a rumbling “cosmic bass note” of gravitational waves thought to be produced by the slow-motion mergers of supermassive black holes across the universe. The observations are the first detections of low-frequency ripples in the fabric of spacetime and promise to open a new window on the monster black holes lying at the centres of galaxies. These objects are millions to billions times the mass of the sun and have played a profound role in shaping galaxies, but remain elusive because no light can escape their vicelike grip. “This is huge news,” said Dr Stephen Taylor, chair of the North American Nanohertz Observatory for Gravitational Waves (Nanograv) consortium, which spearheaded the discovery, and an astrophysicist at Vanderbilt University in Nashville. Dr Michael Keith, a lecturer at Jodrell Bank Centre for Astrophysics and a member of the European team that provided independent evidence for the signal, said: “The results presented today mark the beginning of a new journey into the universe to unveil some of its unsolved mysteries. “We are incredibly excited that after …