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Browsing Tag

X-rays

7 posts
PPhysics
Lasing of a cavity-based X-ray source
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Lasing of a cavity-based X-ray source

  • January 29, 2026
Shortly after the free-electron laser (FEL) concept was proposed in the 1970s11, the first FEL oscillator was developed12…
SSpace
The Champagne Cluster appears here as a large collection of brilliant white lights, each a distinct galaxy. A neon purple cloud stretches across the cluster’s crowded core. Many of the hundred-plus galaxies in the cluster are in two clumps of galaxies towards the top and bottom of center. Some are encircled by a faint glowing haze, while a few foreground stars gleam with diffraction spikes. Some of the smaller galaxies are tinted blue, orange, or red, and some appear more oblong than round, suggesting spiral shapes viewed edge-on. The neon purple cloud sits at the heart of the image, surrounding the most densely-packed part of the cluster. This cloud, which spreads vertically across the cluster, is multimillion-degree gas observed by Chandra. The two clumps of observable galaxies, and the spread of superheated gas, reveal that the Champagne Cluster is in fact two clusters in the process of colliding. Image credit: NASA / CXC / UCDavis / Bouhrik et al. / Legacy Survey / DECaLS / BASS / MzLS / SAO / P. Edmonds / L. Frattare.
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Champagne Cluster is Actually Two Galaxy Clusters in Process of Merging, Astronomers Find

  • January 3, 2026
Astronomers discovered an enormous galaxy cluster called RM J130558.9+263048.4 on December 31, 2020; the date, combined with the…
HHealthcare
Explainer | X-rays free, A&E to cost more: the Post breaks down Hong Kong’s new hospital fees
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Explainer | X-rays free, A&E to cost more: the Post breaks down Hong Kong’s new hospital fees

  • January 1, 2026
Hong Kong will overhaul public hospital fees from January 1 to ensure the sustainable development of its healthcare…
SScience
This XMM-Newton image shows an X-ray view of the interstellar comet 3I/ATLAS. At the center of the image, a bright red spot stands out against a dark background, like a fiery beacon. Starting from this core, faint gradients of purple and blue spread outward, creating a slightly rotated rectangular frame, divided by a thin horizontal line, the detector gap. The red color shows low-energy X-rays, blue marks empty space with very few X-rays. Image credit: ESA / XMM-Newton / C. Lisse / S. Cabot / XMM ISO Team.
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XMM-Newton Offers Incredible X-ray View of Interstellar Comet 3I/ATLAS

  • December 12, 2025
Astronomers using ESA’s XMM-Newton observatory have captured an X-ray image of 3I/ATLAS, the third confirmed interstellar object to…
SScience
An artist’s impression of the flaring, windy supermassive black hole in NGC 3783. Image credit: ESA / ATG Europe.
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Astronomers Spot Extraordinary Blast from Supermassive Black Hole in NGC 3783

  • December 9, 2025
Using ESA’s XMM-Newton and the X-Ray Imaging and Spectroscopy Mission (XRISM), a JAXA-led mission with ESA and NASA…
SSpace
Watch a black hole fall into a star and then blow up
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Watch a black hole fall into a star and then blow up

  • December 9, 2025
“We were all still working on Independence Day and writing proposals and trying to point all the telescopes…
PPhysics
Self-compressed waveform-stable light transients enabling water-window attosecond spectroscopy
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Self-compressed waveform-stable light transients enabling water-window attosecond spectroscopy

  • November 13, 2025
We first demonstrate the creation and field-resolved characterization of light transients, focusing on generating sub-cycle pulses. For this…
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