Signals buried deep in data from gravitational wave observatories imply a collision of two black holes that were clearly born in different places.
Almost all the spacetime ripples that experiments like the Laser Interferometer Gravitational-Wave Observatory, or LIGO, see come from collisions among black holes and neutron stars that are probably close family members (SN: 1/21/21). They were once pairs of stars born at the same time and in the same place, eventually collapsing to form orbiting black holes or neutron star What happens when two different kinds of auroras get together? One spills the other’s secrets.
Amateur astronomers have captured a strange combination of red and green auroras on camera, and physicists — who had never seen such a thing before — have now used these images to learn what may trigger the more mysterious part of the light show,
Photographer Alan Dyer was in his backyard in Canada, when he saw the lights dancing overhead and started filming. “I knew I had something interesting,” says Dyer, who also writes about astronomy. What he didn’t know was that he had just made the most complete recording of this rare phenomenon. A lot of theories exist about the early dark days of the universe, but Chinese scientists have found a new way to get a glimpse into that period. The Discovering the Sky at the Longest Wavelengths (DSL) mission, which is also called Hangmen, will be sending around ten satellites to orbit around the world in order to pick different cosmic signals. The satellites will also block the electromagnetic interference from humans on earth to completely understand the cosmos in a better way. The researchers repeatedly bent one of the beams back and forth and used lasers to measure how the second beam responded to the first beam’s varying gravitational pull. To help maintain a stable temperature and avoid external vibrations that could stymie the experiment, the researchers performed their work 80 meters underground, in what was once a military fortress in the Swiss Alps.
Big G, according to the new measurement, is approximately 6.82 x 10-11 meters cubed per kilogram per square second. But the estimate has an uncertainty of about 1.6 percent, which is large compared to other measurements (SN: 8/29/18). So the number is not yet precise enough to sway the debate over Big G’s value. But the team now plans to improve their measurement, for example by adding a modified version of the test with rotating bars. That might help cut down on Big G’s wiggle room. The researchers repeatedly bent one of the beams back and forth and used lasers to measure how the second beam responded to the first beam’s varying gravitational pull. To help maintain a stable temperature and avoid external vibrations that could stymie the experiment, the researchers performed their work 80 meters underground, in what was once a military fortress in the Swiss Alps.
Big G, according to the new measurement, is approximately 6.82 x 10-11 meters cubed per kilogram per square second. But the estimate has an uncertainty of about 1.6 percent, which is large compared to other measurements (SN: 8/29/18). So the number is not yet precise enough to sway the debate over Big G’s value. But the team now plans to improve their measurement, for example by adding a modified version of the test with rotating bars. That might help cut down on Big G’s wiggle room. The new monoclonal antibody has improvements over an earlier version developed by the same research team. The new version binds more strongly to the targeted malaria parasite protein. It also has a tweak that keeps it from degrading too quickly in the body. This boosts its half-life in the blood (the time it takes for half of the medicine to degrade) to 56 days, almost three times that of its predecessor.
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