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Remarkable gravitational-wave signal detected by the LIGO-Virgo-KAGRA (LVK) Collaboration

Today the LIGO-Virgo-KAGRA (LVK) Collaboration released information on one of the events detected during its current fourth observing run – a gravitational-wave signal from the collision of what is most likely a neutron star with a compact object that is 2.5 to 4.5 times the mass of our Sun. What makes this signal, called GW230529, intriguing is the mass of the heavier object. It falls within a…

White Dwarfs Get a Second Stellar Life Due to Buoyant Crystal Formation

By Milan P. Ilnyckyj, Canadian Institute for Theoretical Astrophysics
Research published in Nature by CITA National Fellow Simon Blouin grants new understanding of delayed white dwarfs.
Your astronomy textbook might describe white dwarfs as the cool and comparatively uninteresting remnants of dead stars. This perspective is challenged by the previously unexplained existence of delayed whit…

The Hubble Trouble is not a CMB one according to major new Atacama Cosmology Telescope results: The Deep Universe Tension with the Nearby Universe continues

The Atacama Cosmology Telescope

From a mountain high in Chile’s Atacama Desert, astronomers with the National Science Foundation’s Atacama Cosmology Telescope (ACT) have taken a fresh look at the oldest light in the universe. Their new observations plus a bit of cosmic geometry suggest that the universe is 13.77 billion years old, give or take 40 million years.

The new estimate matches the one provided by t…

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