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| Webb telescope image of galaxy cluster MACS J0454.1-0300 shows hundreds more galaxies than Hubble captured in 2014. |
Top 15 Space & Astronomy Stories
- Webb Image Shows Hundreds More Galaxies in Distant Cluster — European Space Agency
The James Webb Space Telescope captured galaxy cluster MACS J0454.1-0300 in far greater detail than the Hubble image from 2014. Webb's sensitivity to redder light reveals hundreds of additional galaxies in the same field. The cluster's enormous mass creates gravitational lensing that bends and magnifies light from much more distant orange galaxies. Multiple images of the same background galaxy appear four or more times due to this lensing. Researchers identified a group of galaxies from when the universe was two billion years old and an individual galaxy from when it was just 800 million years old. The data come from observing programmes 5058 and 6882. The brilliant golden galaxies make up the cluster, but the orange ones are much farther away. Gravitational lensing occurs due to the enormous mass of the golden galaxies. This is the first time researchers have spotted multiple images of the same galaxy more than once in the same cluster. Source: esa.int - Starlink Satellites Begin Orbit Raising With Argon Engines — Jonathan McDowell
The satellites will use their onboard Argon ion engines to raise their orbits to the 350 to 450 kilometre range. Orbit raising is expected to begin within a day or two. The satellites should then remain in orbit for five years. The timeline for each satellite varies depending on its initial conditions after deployment. Source: x.com - NASA Faces Questions on Low-Earth Economy Future — Ars Technica
An article examines the future of the low-Earth economy that NASA has worked for decades to establish. It asks whether that economy is at risk of disappearing. The piece explores the Dragon dilemma and notes that there appear to be no good answers at present. Source: arstechnica.com - Falcon Heavy Rolls Out for NROL-97 Mission — SpaceX
A Falcon Heavy rocket rolled out to launch pad 39A ahead of the National Reconnaissance Office and U.S. Space Force NROL-97 mission. The rollout prepares the vehicle for its upcoming national security payload. Source: x.com - Super Heavy Lifts Off With 33 Raptor 3 Engines — SpaceX
A Super Heavy booster lifted off powered by 33 Raptor 3 engines. The test demonstrated the performance of the updated engine configuration during ascent. Source: x.com - Smile Mission Begins Science Operations — European Space Agency
The European-Chinese Smile mission was declared ready on 23 September to study how Earth responds to the solar wind of charged particles. The spacecraft launched on 19 May and reached its target orbit on 20 June. A busy commissioning period followed arrival in orbit before science operations could start. Source: esa.int - Amateur Astronomer Captures Possible Pluto Image — Reddit r/astronomy
An observer using a Celestron StarSense Explorer DX 130az telescope and iPhone 16 captured a faint dot at the location where Pluto should appear according to Stellarium software. The observer remains skeptical because Pluto is distant, dim, and small. The setup is modest yet the dot aligned precisely with predicted coordinates. Source: reddit.com - Widefield Image Captures Firework Galaxy NGC 6946 — Reddit r/astronomy
An astrophotographer produced a widefield image of NGC 6946 using 19 hours and 48 minutes of integration time across LRGB and Ha filters. The image was taken with a Sharpstar 15028HNT CF telescope and ZWO ASI2600MM Pro camera from a Bortle 4 site. Ha data helped bring out nebulosity in the galaxy’s arms. Source: reddit.com - New Research Suggests Detecting Life on Enceladus May Be Easier — Universe Today
Planetary scientists from Freie Universität Berlin published two studies indicating that a spacecraft could identify evidence of life on Enceladus more easily than previously thought. The work focuses on sampling material from the moon’s plumes. Earlier models appear to have used overly conservative assumptions about dilution and detection thresholds. Source: universetoday.com - Starbirth Rate Declining in the Modern Universe — Universe Today
An international team led by Hong Guo of the Chinese Academy of Sciences investigated why the universe has been forming fewer stars recently. The researchers examined whether insufficient star-forming material explains the decline or whether another process is involved. The study aims to distinguish between these possibilities using observational data. Source: universetoday.com - Helium Escape From Exoplanet LHS 1140b Raises Questions — Phys.org
Reports this summer described helium gas escaping from the atmosphere of exoplanet LHS 1140b. The finding moved the planet from scientific journals into mainstream discussion. The helium signature has drawn attention because of its potential implications for atmospheric studies. Source: phys.org - Red and Blue Star System Could Appear Purple From Afar — Reddit r/astronomy
An observer asked whether a star system containing both a red star and a blue star could appear purple when viewed from a distance. The question highlights how combined stellar colours might blend at great range. Source: reddit.com
Cosmic Spotlight
The Enceladus studies from Freie Universität Berlin indicate that evidence of life could be detected more readily than earlier models suggested. The research focuses on how a spacecraft might sample material from the moon's plumes. Previous assumptions about dilution and detection thresholds appear to have been overly conservative. The findings open a clearer path for future missions targeting ocean worlds. One question remains: how quickly could instruments distinguish biological from abiotic chemistry in those samples?
Cosmic Deep Dive: How Gravitational Lensing Reveals the Early Universe
A galaxy whose light has traveled for more than thirteen billion years can be stretched into multiple arcs by a foreground cluster whose own light left eight billion years ago. The cluster acts like a natural telescope whose mass bends every photon path that passes near it. In the MACS J0454.1-0300 field some background features are magnified by factors exceeding three hundred, turning regions only five light-years across into objects large enough for Webb to resolve. Light from a galaxy that existed when the universe was eight hundred million years old reaches us only because the cluster's gravity has folded space to bring that light our way. We can measure the exact positions and brightnesses of those multiple images, yet we still cannot predict from first principles which distant galaxies will be lensed most strongly by any given cluster.
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