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A recent study published in Nature Astronomy has revealed that the dwarf galaxies orbiting around Andromeda, our neighboring galaxy, are distributed in such an uneven way that it calls into question the most widely accepted cosmological theories. According to the researchers, this asymmetric arrangement is so extreme that it is almost impossible to explain with current models of the universe.

Andromeda, also known as M31, is the spiral galaxy closest to the Milky Way and, like our galaxy, is surrounded by a group of smaller dwarf galaxies that orbit around it. What has surprised scientists is that these dwarf galaxies are not evenly distributed.

Of the 37 observed dwarf galaxies, all but one are located on one side of Andromeda—specifically, the side facing the Milky Way. This uneven arrangement is as if, when throwing a handful of stones around a tree, almost all of them landed on just one side.

Astronomers are unraveling the mystery behind Ansky, a black hole system emitting powerful, repeating X-ray bursts called QPEs. These outbursts may result from a small object colliding with a gas disk, sending debris flying at near-light speeds. New Glimpse Into Mysterious X-Ray Outbursts For t

Astronomers using NASA’s IXPE satellite have finally cracked a cosmic mystery—how X-rays are produced in the energetic jets of supermassive black holes like the blazar BL Lacertae. The blazar BL Lacertae—a type of active galaxy powered by a supermassive black hole with bright, fast-moving jets ai

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It’s hard to interpret the strange results of quantum mechanics, though many have tried. Interpretations range from the outlandish—like the multiple universes of Many Worlds, to the almost mundane, like the very mechanical Pilot Wave Theory. But perhaps we’re converging on an answer, because some are arguing that these two interpretations are really the same thing.

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The blazar BL Lacertae, a supermassive black hole surrounded by a bright disk and jets oriented toward Earth, provided scientists with a unique opportunity to answer a longstanding question: How are X-rays generated in extreme environments like this?

NASA’s IXPE (Imaging X-ray Polarimetry Explorer) collaborated with radio and to find answers. The results, available on the arXiv preprint server and set to be published in the journal Astrophysical Journal Letters, show that interactions between fast-moving electrons and particles of light, called photons, must lead to this X-ray emission.

Scientists had two competing possible explanations for the X-rays, one involving protons and one involving electrons. Each of these mechanisms would have a different signature in the polarization of X-ray light. Polarization is a property of light that describes the average direction of the electromagnetic waves that make up light.

What is time? Speaking time travel, black holes and the remits of science. In this podcast conversation, we speak with Professor David Wilkinson — physicist and author of popular science books on Stephen Hawking to explore the question: can we ever fully understand time through science, or does it open up more mystery?

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How do you distinguish a galaxy from a mere cluster of stars? That’s easy, right? A galaxy is a large collection of millions or billion of stars, while a star cluster only has a thousand or so. Well, that kind of thinking won’t get you a Ph.D. in astronomy! Seriously, though, the line between galaxy and star cluster isn’t always clear. Case in point, UMa3/U1.

It’s easy to distinguish galaxies such as Andromeda and the Milky Way. They are large, gravitationally bound, and dominated by dark matter. It’s also easy to distinguish star clusters such as the Pleiades. They are loosely bound star groupings without dark matter. But for a type of small dwarf galaxy known as Ultra-Faint Dwarfs (UFDs) the dividing line gets fuzzy.

UFDs are dominated by dark matter. The mass of the Milky Way, for example, is about 85% dark matter. An ultrafaint dwarf galaxy, however, can have a thousand times more dark matter than luminous matter. This is why they are so faint. Since UFDs often contain some of the oldest stars in the Universe, astronomers love to study them for clues on the origins of galaxies. Which brings us to UMa3/U1.