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Cold, dense clouds in the interstellar medium of our Galaxy are 4–5 orders of magnitude denser than their diffuse counterparts. Our Solar System has most likely encountered at least one of these dense clouds during its lifetime. However, evidence for such an encounter has not been studied in detail yet. Here we derive the velocity field of the Local Ribbon of Cold Clouds (LRCC) by modelling the 21 cm data from the HI4PI survey, finding that the Solar System may have passed through the LRCC in the constellation Lynx 2–3 million years ago. Using a state-of-the-art simulation of the heliosphere, we show that during the passage, the heliosphere shrinks to a scale of 0.22 au, smaller than the Earth’s orbit around the Sun. This would have put the Earth in direct contact with the dense interstellar medium for a period of time and exposed it to a neutral hydrogen density above 3,000 cm−3. Such a scenario agrees with geological evidence from 60Fe ....
Episode 201: Riding the Radcliffe Wave | Radcliffe Institute for Advanced Study at Harvard University harvard.edu - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from harvard.edu Daily Mail and Mail on Sunday newspapers.
Astronomers detail oscillation of our giant neighbor — Harvard Gazette harvard.edu - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from harvard.edu Daily Mail and Mail on Sunday newspapers.
NASA’s Nancy Grace Roman Space Telescope team has announced plans for an unprecedented survey of the plane of our Milky Way galaxy. It will peer deeper into ....
NASA Team Picks Survey for Far Side Galactic Mapping miragenews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from miragenews.com Daily Mail and Mail on Sunday newspapers.