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One of the most extreme stars in the Milky Way has just gotten even weirder. Scientists have measured the mass of a neutron star named PSR J0952-0607, and found that it is the most massive neutron star ever discovered, registering 2.35 times the mass of the Sun. If true, this is very close to the theorized upper mass limit of about 2.3 solar masses for neutron stars, which is an excellent laboratory for studying these ultra-dense stars at what we think are on the verge of collapse, in hopes of better understanding. strange quantum states of the matter they are made of. “We know roughly how matter behaves at nuclear densities, such as in the nuclei of uranium atoms,” said astrophysicist Alex Filippenko of the University of California, Berkeley. “A neutron star is like one giant core, but when you have one and a half solar masses of this material, which is about 500,000 Earth masses of cores all stuck together, it’s not at all clear how they’re going to behav...

A rotating neutron star periodically swings radio rays (green) and gamma rays (magenta) past Earth in this artist’s concept of a black widow pulsar. The pulsar heats the side of its stellar mate that faces twice as hot as the sun’s surface and slowly vaporizes it. Credit: NASA Goddard Space Flight Center/Cruz deWilde Observations of a planet-sized dim star helped weigh its pulsar companion milliseconds. A collapsing solid star has torn apart and consumed almost the entire mass of its companion star and, in the process, grew into the heaviest star. neutron star A neutron star is the collapsing core of a large star (between 10 and 29 solar masses). Neutron stars are the smallest and densest stars that have ever existed. Although neutron stars typically have a radius of only 10 – 20 kilometers (6 – 12 miles), they can have a mass of about 1.3 – 2.5 the mass of the Sun. ” data-gt-translate-attributes=”[{” attribute=””>neutron s...

Neutron star collisions are an opportunity to see what’s inside these incredible objects Astronomers have for the first time been able to detect collisions with dead suns known as neutron stars, thanks to a powerful new telescope. Neutron star collisions are key to our understanding of the Universe. They are thought to have created the heavy metals that formed the stars and planets like us billions of years ago. The light from the collision was only visible for a few nights so telescopes had to race to find it. Astronomers observed one of these collisions in 2017, but most found it by luck. The British Gravity Wave Optical Transient Observer (GOTO), located above the clouds on the Spanish volcanic island of La Palma will now systematically hunt them down. “When the really good detection comes along, everything has to be done to the max,” Prof Danny Steeghs, from the University of Warwick, told me in La Palma. “Speed ​​is of the essence. We are looking for somethi...

Numerical simulation of a black hole-neutron star merger. Density profiles are shown in blue and green, magnetic field lines penetrating black holes are shown in pink. Unbound material is shown in white its velocity with a green arrow. Credit: K. Hayashi (Kyoto University) Using supercomputer calculations, scientists at the Max Planck Institute for Gravity Physics in Potsdam and from Japan showed a consistent picture for the first time: They modeled the complete process of a black hole colliding with a neutron star. In their study, they calculated the process from the final orbit through merging to the post-merger phase where, according to their calculations, high-energy gamma-ray bursts could occur. The results of their study have now been published in the journal D Physical Overview . Nearly seven years have passed since the first detection of gravitational waves. On September 14, 2015, LIGO detectors in the US recorded the signa...