A 2022 Gamma Ray Burst Was So Powerful, it was Detected by Spacecraft Across the Solar System

By Brian Koberlein - September 15, 2023 12:14 PM UTC | Solar Astronomy
Gamma-ray bursts are some of the most powerful explosions ever detected, emitting more radiation than the rest of their host galaxy combined. In October 2022, a gamma-ray burst struck the Solar System and interacted with the heliosphere. This set off charged particle detectors in spacecraft, from Mars to Earth, to the Earth-Sun L1 Lagrange Point. These separate detections allowed astronomers to track the motion of the radiation as it moved through the Solar System and allowed them to determine the location of the explosion.
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If Neutron Stars Have Mountains, They Should Generate Gravitational Waves

By Brian Koberlein - September 14, 2023 12:03 PM UTC | Stars
Astronomers have discovered the gravitational waves released by colliding black holes, neutron stars, and even the background waves from merging supermassive black holes. A new paper proposes that advanced gravitational wave observatories might be able to detect the presence of "mountains" on spinning neutron stars. Although they're incredibly dense, neutron stars have layers, and as they cool, their solid crusts might deform into regions farther from the central core. This would create a wobble that would release gravitational waves.
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Do The Gaps in Protoplanetary Disks Really Indicate Newly Forming Planets?

By Brian Koberlein - September 12, 2023 12:45 PM UTC | Exoplanets
Modern instruments like ALMA have revealed newly forming stars surrounded by accretion disks. These images are so sensitive you can even see the gaps in the disk where new planets form, right? Maybe not. According to a new paper, systems with many newly forming planets are inherently unstable, so they can't all indicate new worlds. Some gaps and rings around the stars might just indicate collections of pebbles that can never accrete into actual planets. The challenge will be to figure out which is which.
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