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☆ An experiment that reaches across the galaxy has 'heard' an invisible sea of ripples in space-time for the first time. It's surprisingly loud.
▼ + stars: | 2023-06-30 | by ( Morgan Mcfall-Johnsen | ) www.businessinsider.com time to read: +9 min

Those ripples are probably the distant thunder of countless collisions between supermassive black holes, throughout space and time. He predicted that the intense gravity of extremely massive objects, like black holes, warps the fabric of space-time. The NSF funded the 15-year experiment, which is called the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). Supermassive black holes are thought to exist at the center of every galaxy. Her lab runs computer models of merging supermassive black holes to predict how they behave and what signals they send out into space.

Persons: —, Albert Einstein's, Aurore, Sean Jones, Manuela Campanelli, NASA's James Webb, Noll, Kip Thorne, NASA Goddard Thorne, NANOGrav, LIGO, Stephen Taylor, Lorenzo Ennoggi Organizations: Service, Sciences, National Science Foundation, NSF, American Nanohertz, Rochester Institute of Technology, NASA's James Webb Space, Hubble, Telescope, NASA, ESA, Hubble Heritage Locations: Louisiana, Washington, Europe, India, Australia, China

☆ Astronomers ‘hear’ the celestial choir of gravitational waves for the first time
▼ + stars: | 2023-06-29 | by ( Ashley Strickland | ) edition.cnn.com time to read: +7 min

CNN —Astronomers have been able to “hear” the celestial hum of powerful gravitational waves, created by collisions between black holes, echoing across the universe for the first time. Gravitational waves, initially predicted by Albert Einstein in 1916, are ripples in space-time that were first detected in 2015. Einstein theorized that gravitational waves would stretch and compress space as they moved across the universe, affecting how radio waves travel. More than 190 scientists set out to discover the frequencies of gravitational waves as part of the North American Nanohertz Observatory for Gravitational Waves collaboration, also known as NANOGrav. Searching for a celestial choirThe newly detected gravitational waves are the most powerful ever measured.

Persons: Albert Einstein, Einstein, ”, Chiara Mingarelli, We’ve, Simonnet, Scott Ransom, “, ” Ransom, Luke Kelley, ” Kelley, it’s, ” Mingarelli, “ It’s, Stephen Taylor Organizations: CNN —, American Nanohertz, Green Bank, Yale University, National Radio Astronomy, University of California, Vanderbilt University Locations: Arecibo, Puerto Rico, West Virginia, New Mexico, Berkeley, Europe, India, China, Australia

☆ The Cosmos Is Thrumming With Gravitational Waves, Astronomers Find
▼ + stars: | 2023-06-28 | by ( Katrina Miller | ) www.nytimes.com time to read: +1 min

On Wednesday evening, an international consortium of research collaborations revealed compelling evidence for the existence of a low-pitch hum of gravitational waves reverberating across the universe. “I like to think of it as a choir, or an orchestra,” said Xavier Siemens, a physicist at Oregon State University who is part of the North American Nanohertz Observatory for Gravitational Waves, or NANOGrav, collaboration, which led the effort. Scientists said that, so far, the results were consistent with Albert Einstein’s theory of general relativity, which describes how matter and energy warp space-time to create what we call gravity. “The gravitational-wave background was always going to be the loudest, most obvious thing to find,” said Chiara Mingarelli, an astrophysicist at Yale University and a member of NANOGrav. “This is really just the beginning of a whole new way to observe the universe.”

Persons: ”, Xavier Siemens, Siemens, NANOGrav, Albert Einstein’s, Chiara Mingarelli Organizations: Oregon State University, American Nanohertz, Big Bang, Yale University

Conform New Atlas, echipa de cercetare NANOGrav a descoperit un „semnal puternic” care ar putea reprezenta fundalul undei gravitaționale. Descoperirea undelor gravitaționale ne-ar putea ajuta să înțelegem mai bine cosmosul. Undele gravitaționale ar fi cheia pentru descoperirea altor dimensiuni în UniversDacă vrem să identificăm alte dimensiuni în spațiul cosmic, undele gravitaționale ar putea fi cheia care ne-ar permite să le localizăm. Această nouă ipoteză ne-ar putea permite să răspundem unui mister vechi de secole, anume de ce gravitația apare să fie mai slabă decât alte forțe fundamentale din Univers. O posibilă explicație a oamenilor de știință este că gravitația „scapă” către alte dimensiuni pe care trebuie să le detectăm.

Persons: NANOGrav Organizations: Atlas, Science Alert

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