astronomy8.28 min read
Orion Nebula Exposes Complex Shells From Repeated Stellar Feedback
1 hour ago•Source: Sci.News
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8.57 min•3 days ago
Isotopes Trace Interstellar Visitor 3I/ATLAS to Ancient, Metal-Poor Disk
Astronomers using ESO's Very Large Telescope measured carbon and nitrogen isotope ratios in the interstellar comet 3I/ATLAS, finding carbon-12/carbon-13 ~151 and nitrogen-14/nitrogen-15 ~363. These values are higher than typical solar-system comets, suggesting formation in the cold outer disk around an older, metal-poor star, consistent with isotope-selective chemistry in such environments. The results, published online July 6, 2026 in Nature Astronomy, provide a rare glimpse into material from another planetary system and the efficiency of planetesimal formation around ancient stars.
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JWST maps the cosmos with its largest, most detailed 3D survey
Live Science•5 days ago
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Bullet Cluster Results Put MOND Back in Spotlight, Questioning Dark Matter Proof
Universe Today•7 days ago
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Methane, aerosols and a warm nightside on a planet circling a white dwarf
JWST/NIRSpec PRISM transmission spectra of WD 1856 b, a Jupiter-sized planet transiting a nearby white dwarf, reveal methane and other hydrocarbons, a scattering aerosol haze, and a nightside thermal emission. The atmosphere is metal-rich (CH4 at a few percent to ~7–20% in retrievals) with an opaque cloud deck near 100 mbar, and the planet’s nightside temperature is about 390–412 K, much warmer than the 160 K equilibrium expected for this system. Mass is constrained to ~4.3–10.9 Jupiter masses. The data imply a reheating event during migration into the white dwarf phase, most consistent with high-eccentricity migration and tidal circularization rather than common-envelope evolution, offering a rare window into the fate of giant planets around Sun-like stars after stellar death.
Six Explosions Later, a Star Defies Explanation
A star designated iPTF14hls, first seen in 2014 as a supernova, has since exploded at least six times, with its brightness peaking multiple times over about 1,000 days while staying at a steady 5,000–6,000 K. Archival data reveal a 1954 explosion at the same location, and the star—at least 50 solar masses—appears to eject material far more slowly than typical supernovae. Several ideas (antimatter burning, pulsational pair-instability, magnetar with evolving fields) fail to explain all features. The star faded into a remnant nebula by 2018, and the Hubble Space Telescope continues to monitor the site.
Webb Spots Dramatic Day-Night Atmosphere Split on WASP-121 b
JWST transit observations of WASP-121 b reveal a clear day–night atmospheric split: the evening terminator is hotter and expands more, absorbing more starlight, likely driven by eastward winds; CO signals rise with temperature, while water is depleted at the upper atmosphere, hinting at clouds cooling the morning side. By tracking the planet's rotation during transit, researchers map atmospheric conditions by longitude and aim to study more ultra-hot Jupiters with this method.
Hidden Icebergs Behind JWST’s Little Red Dots
JWST’s Little Red Dots appear far brighter and more common at early cosmic times than simple star-formation models would allow. Explanations span instrumental effects (JWST’s higher throughput), high-resolution simulations revealing rare overdense regions, bursty star formation that can exceed steady-state limits, and possible contributions from active galactic nuclei or exotic energy sources. A hotter, denser early universe could shift the stellar mass distribution toward fewer low-mass stars (a bottom-light IMF), potentially lowering inferred masses; yet observations of ancient globular clusters challenge extreme bottom-light IMF scenarios. No single explanation fits all observations, so the true nature likely involves a mix of stars, black holes, and other processes, awaiting further study.
Milky Way Photography: June tips to capture our galaxy this summer
June is a prime time in the Northern Hemisphere to shoot the Milky Way as the galaxy’s bright core climbs into the southeastern sky around 11:30 p.m. Local viewing windows are best between the last-quarter moon around June 8 and the days after the new moon around June 14, with dark skies crucial. Use a full‑frame DSLR/mirrorless with RAW, a sturdy tripod, and a wide lens (14–24 mm); set about f/2.8, ISO 3200–6400, and 10–25 second exposures, then manually focus and post‑process for contrast and color. Don’t forget compelling foregrounds to add depth, and consider southern destinations in July–September as the Milky Way moves across the sky.
Galaxy in Focus: 2026 Milky Way Photographer of the Year Winners Unveil Stunning Night Skies
The 2026 Milky Way Photographer of the Year winners showcase dramatic panoramas of the Milky Way’s center from around the world, including Geminid Symphony Over La Palma and Galactic Gandalf by Evan McKay, with entries from New Zealand, Chile, Argentina, and Yellowstone; the collection highlights astrophotographers’ craft—from long exposures and focus stacking to advanced gear—that reveal the Milky Way’s colors and structure across diverse landscapes.
Venus-Jupiter Conjunction Dazzles Skies Worldwide in 2026
EarthSky highlights the spectacular Venus–Jupiter conjunction of 2026, with its closest approach on June 8–9, and a global gallery of community photos showing Venus as the brightest object near Jupiter (with Mercury visible near the horizon in some shots). Many images feature Gemini’s Castor and Pollux, and readers are invited to submit their own photos or view a video montage of the event.
JWST Uncovers Methane in Interstellar Comet 3I/ATLAS, Hinting at Hidden Chemistry
Using JWST's MIRI instrument, astronomers directly detected methane in the coma of interstellar comet 3I/ATLAS—the first methane detection in an ISO. The methane-to-water ratio is unusually high, while carbon dioxide remains abundantly released near the nucleus, reinforcing 3I/ATLAS’s CO2-rich chemistry and signaling formation conditions outside our Solar System. Complementary detections from Hubble, ALMA, and SPHEREx show a ranging volatile inventory, including cyanogen, nickel, methanol, and HCN; near-infrared data reveal water, CO2, and CO. Methane likely sublimated from subsurface ice as the comet heated near perihelion, pointing to a formation history unlike typical Solar System comets. The findings appear in ApJL 2026 by Belyakov et al.
Cosmic Cannibals: Red Dwarfs Reveal Planet-Devouring Signatures
Astronomers using Gaia-ESO data found six red-dwarf stars with unexpectedly high lithium in their atmospheres, a chemical that should be destroyed deep inside these stars. Because lithium should vanish quickly, its recent appearance signals the accretion of rocky planetary material, a phenomenon dubbed necroplanetology. The six stars (out of 318 examined in clusters) suggest roughly 3–10 Earth masses of planetary matter may have been swallowed, implying planet-devouring could occur in a notable fraction of red dwarfs depending on how long lithium lasts in their atmospheres. This finding offers a new way to study planet formation and early-system evolution.
Cosmic scale: from kilometer-sized rocks to galaxy-sized grandeur
A broad tour of the cosmos’ size spectrum, from hydrostatic, kilometer-scale bodies like small moons and asteroids to white dwarfs, neutron stars, and black holes, then up through dwarf galaxies, huge galaxies, galaxy clusters, and the vast cosmic web. The article explains how gravity, hydrostatic equilibrium, and dark matter shape these objects, how light and gravitational lensing reveal their properties, and notes that while some structures seem enormous (e.g., the Sloan Great Wall, Train Wreck clusters), no larger bound structures have been confirmed. It emphasizes the universe’s staggering range of scales and complexities.