Astronomers Rule Out One Explanation for the Hubble Tension

By Brian Koberlein - January 16, 2024 02:16 PM UTC | Cosmology
Astronomers measure the Universe's expansion rate and have found a discrepancy between the speed nearby versus the speed measured in the Cosmic Microwave Background. This is known as the Hubble Tension, and the search is on for anything that could explain it. One possible explanation is measurement error, which causes the Cepheid variables in galaxies to be too close together, obscuring results. New observations from JWST have removed this as an explanation.
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Gigantic Galaxy Clusters Found Just Before They're Awash in Star Formation

By Brian Koberlein - January 15, 2024 01:00 PM UTC | Extragalactic
Astronomers have found examples of giant galaxy clusters dozens of times larger than the Milky Way with all the raw materials for star formation, but they haven't gotten going yet. NASA's Chandra and other telescopes found regions of gas blazing in x-ray radiation between 3.4 and 9.9 billion light-years from Earth. The total mass of the gas outweighs all the stars typically found in hundreds of galaxies in galaxy clusters.
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Dark Matter Could Map the Universe's Early Magnetic Fields

By Brian Koberlein - January 12, 2024 09:58 AM UTC | Cosmology
Even though we still don't know what dark matter is, astronomers can use it as a natural telescope lens with gravitational lensing. A new theoretical paper suggests that mini-halos of dark matter in the early Universe could be used as a probe to map out primordial magnetic fields. These magnetic fields are everywhere in the cosmos today, but were they produced in the early stages of the Universe? It depends on the influence of magnetic fields on dark matter.
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Multiple Supernova Remnants Merging in a Distant Nebula

By Brian Koberlein - January 06, 2024 11:59 AM UTC | Extragalactic
The 30 Dor B star-forming region is one of the most dramatic places in the Universe. It is located in the Large Magellanic Cloud, about 160,000 light-years from Earth, and is home to some of the most massive stars ever seen. It's been forming stars for the last 8-10 million years, the largest of which have detonated as supernovae, hurling material and seeding even more stars. A new image from Chandra has identified the remnants from at least two supernovae in the nebula.
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