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Tag: formation

Study reveals secrets of planet formation

Study reveals secrets of planet formation

Science
Oct. 13 (UPI) -- Scientists have discovered a new explanation for how young stars and their newborn planets avoid "radial drift," a phenomenon that can rob stellar systems of their planet-forming material.Most planets form as material coalesces in a star's circumstellar disk of dust and debris. But debris disks can also diffuse or be eaten up by their host star, and researchers have struggled to figure out why this doesn't happen more often.Gas in a circumstellar disk should exert a drag force on debris, pulling the dust inward where it is consumed by the host star. The process, called radial drift, can deplete the material a young stellar system needs to form and grow planets.But new images of the debris disk surrounding the star V1247 Orionis has offered scientists insights into how youn...
Study reveals importance of hydrogen atoms for star formation

Study reveals importance of hydrogen atoms for star formation

Science
Oct. 10 (UPI) -- Until recently, astronomers assumed hydrogen molecules fueled star formation in young galaxies. But new research suggests atomic hydrogen may be equally important to star formation.In the local universe, most hydrogen found inside galaxies exists as individual atoms. Scientists assumed younger galaxies would host less atomic hydrogen and more molecular hydrogen. But cosmic surveys suggest even the earliest galaxies were rich in atomic hydrogen.Now, new analysis by researchers at the University of Western Australia and the International Center for Radio Astronomy Research confirms even galaxies featuring intense rates of star formation host large amounts of atomic hydrogen.Previous studies of "cosmic noon" galaxies have revealed massive reservoirs of molecular hydrogen. Cos...
Study shows star formation influenced by environmental conditions

Study shows star formation influenced by environmental conditions

Science
Sept. 15 (UPI) -- Scientists at Niels Bohr Institute at the University of Copenhagen have determined that new star formation is influenced by local environmental conditions.According to the classical model, a star is formed when a prestellar core, a roundish accumulation containing 99 percent gas and 1 percent dust, collapses due to overweight, resulting in the formation of a star in the center of the collapse. This is followed by the formation of a disk of gas and dust rotating around said star."This is the star's protoplanetary disk, and planets are thought to be formed in such disks -- planet Earth being no exception," Michael K├╝ffmeier, astrophysicist at the institute, said in a press release.Researchers from the institute carried out computer simulations of the formation of hundreds o
Observations suggest black hole formation scenarios

Observations suggest black hole formation scenarios

Science
Aug. 23 (UPI) -- Scientists at the University of Birmingham have identified formation scenarios of black holes by observing gravitational waves.The study, published today in Nature, utilized the LIGO gravitational wave detector in 2015 and 2017 to make landmark observations of gravitational waves.Physicists found that the first detected gravitational waves observed in 2015 were produced during the final fraction of a second of the merger of two black holes to produce a single, massive spinning black hole.The first formation scenario researchers found was that black holes are spinning slowly leading to something different happening to stars that form black holes than those in Earth's galaxy. The second scenario was that black holes spin rapidly, similar to those in Earth's galaxy, but that ...