astronomy5.315 min read
JWST spots wind-driven clouds cycling around a hot exoplanet 690 light-years away
4 days ago•Source: Nature
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6.14 min•6 days ago
Ancient Galactic Collision Shaped the Milky Way’s Spin
Astronomers link an 11-billion-year-old major merger, Gaia–Sausage–Enceladus, to the Milky Way’s evolving disk, showing the collision triggered early starbursts and helped establish the current rotation; simulations with Auriga and observations of star clusters connect these violent events to disk rebuilding and lasting structural imprints.
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Milky Way Turbulence Reveals Hidden Structure in Distant Light
The Daily Galaxy•9 days ago
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Cosmic Web in Sharp Focus: Direct Picture Maps the Universe’s Hidden Gas Highways
ScienceDaily•10 days ago
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Webb Telescope Spots One of the Earliest Galaxies, Tracing the First Stars
Using the James Webb Space Telescope, astronomers captured LAP1-B, one of the universe’s earliest and faint galaxies, dating to about 13 billion years ago (roughly 800 million years after the Big Bang). Gravitational lensing by a foreground cluster amplified its light ~100x, enabling spectroscopy that reveals extremely low metal content and signatures of Population III stars, including a high carbon-to-oxygen ratio. The data also suggest the galaxy sits in a massive dark matter halo, offering critical clues about how the first galaxies formed and evolved in the early cosmos (Nature).
Molten, sulfur-rich exoplanet forces rethink of planet types
Astronomers report the discovery of L 98-59 d, a distant exoplanet with a global magma ocean and a dense sulfur-rich atmosphere, whose extreme geology challenges current planetary classifications and suggests more diverse worlds await discovery as next-generation telescopes come online.
Mercury’s Hidden Diamond Layer Redefines Its Inner Story
A study suggests Mercury might contain a 9–11 mile (15–18 km) thick diamond layer at the core–mantle boundary, formed as carbon-rich material crystallized during magma-ocean cooling and core solidification, with sulfur facilitating diamond stability; such a layer could affect heat flow and Mercury’s magnetic field, but the idea awaits confirmation from future missions.
Twin Exoplanets Ride Inward Together, Rewriting Hot-Jupiter Origins
Astronomers using the James Webb Space Telescope studied TOI-1130, a system where a hot Jupiter (TOI-1130c) hosts a close companion mini-Neptune (TOI-1130b). The pair likely formed beyond the frost line and migrated inward together into a 2:1 resonance, with TOI-1130b showing a heavy atmosphere rich in water vapor, CO2, SO2 and methane. This rare architecture suggests hot Jupiters can form with companions and migrate as a pair, challenging prior ideas about planetary formation.
Behemoth Galaxy From 12 Billion Years Ago Defies Spin, Outnumbers Milky Way in Stars
The James Webb Space Telescope revealed XMM-VID1-2075, a massive galaxy from about 12 billion years ago with several times more stars than the Milky Way, yet showing no detectable rotation, challenging current ideas about early galaxy dynamics and suggesting a possible single high-energy interaction rather than multiple mergers.
Four Laser Beacons Sharpen Our View of the Cosmos from Earth
Astronomers use ESO's Very Large Telescope Interferometer to project four laser guide stars into the upper atmosphere, enabling adaptive optics that correct atmospheric distortion and produce crisper, space-like images from ground-based telescopes, including detailed studies of distant regions like the Tarantula Nebula.
Phobos May Shatter Earlier Than Expected in Violent Tidal Breakup
New research suggests Mars’s inner moon Phobos could break apart much sooner than the Roche limit due to its rubble-pile makeup and increasing tidal distortion. Initial surface shedding is predicted around 2.25 Mars radii, with larger fragmentation at about 2.15–2.13 RM, and instability near ~2.09 RM that could trigger breakup. Debris from these events may re-impinge on Phobos, accelerating destruction in a scenario called a sesquinary catastrophe. The MMX mission, launching in 2026, will study Phobos’s interior to refine these timelines.
Hidden Filaments in Milky Way Core Trace Ancient Black Hole Outflow
Astronomers using the MeerKAT radio telescope found a new population of horizontal, 5–10 light-year filaments near the Galactic Center that point toward Sagittarius A*. Their thermal emissions and alignment along the galactic plane differ from previously known vertical filaments, suggesting a past energetic outflow from the Milky Way’s central black hole and offering clues about its accretion disk orientation and history.
May 2026 Brings Double Moon, Brisk Meteors, and a Clear Milky Way Core
May 2026 offers a rare lunar pair (Flower Moon on May 1 and a blue moon on May 31), a peak Eta Aquariid meteor shower with moonlight limiting visibility, close Mars–Saturn conjunctions around May 12–13, a bright Moon–Venus pairing on May 18, and the best Milky Way core viewing near the May 16 new moon, making it one of the year's most rewarding observing windows for skygazers and astrophotographers.
May 2026 Night Sky: Your Month-Long Guide to Celestial Highlights
Space.com's May 2026 night-sky calendar highlights the month’s key observing events—from the Flower Moon on May 1 and a Blue Moon on May 31, to planetary encounters with Venus and Jupiter, several notable deep-sky targets (including M64, M81/M82, and M51), meteor showers like the Eta Aquariids and Eta Lyrids, and prime Milky Way viewing on dark, clear nights. The guide also offers practical observing tips (dark adaptation, averted vision, filters) and a day-by-day calendar to help stargazers plan all month long.