Tag

Space And Astronomy

All articles tagged with #space and astronomy

space-and-astronomy1 month ago•53 min saved

US Air Force Antarctic flight rerouted after space debris warning

A U.S. Air Force cargo flight bound for Antarctica turned back from Christchurch after an FAA NOTAM warned of Russian aerospace activity and possible debris over the southern Indian Ocean. Space.com cited a warning from Russian authorities about space activity potentially hazardous to aviation en route to Antarctica, but the USAF has not publicly explained the reversal. The incident echoes past debris scares (China’s Long March 5B and SpaceX Starship) and highlights growing calls for better space traffic coordination as launch activity increases, which could affect future Antarctic logistics.

via yahoo.com|

#antarctica #notam #space

space-and-astronomy1 month ago•49 min saved

China outlines Mars samples return plan to beat US by 2031

China announced a timeline to retrieve Mars surface samples with the Tianwen-3 mission (planning a 2028 launch) that would collect about 500 grams and return them to Earth by 2031, with analysis in a biosphere‑guarded lab in Anhui. If funded and realized, it would surpass NASA/ESA efforts for Mars sample return, whose program has faced funding cuts, and could offer biosignature insights about whether Mars hosted life, though such plans remain contingent on diplomacy, funding and technical success.

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#china-space-program #mars-samples #nasa-msr

space-and-astronomy1 month ago•53 min saved

Webb spots Arp 263: a quirky galaxy shaped by a long-ago merger

NASA’s James Webb Space Telescope captured a striking image of Arp 263 (NGC 3239), a distorted irregular galaxy about 25 million light-years away thought to be the product of a past merger between two galaxies. Its stars aren’t aligned with its hydrogen gas, indicating a gravitational tug-of-war with a former companion now dissolved; a foreground Milky Way star, BD+17 2217, appears in the frame. Webb’s Near-Infrared Camera reveals clusters of newly formed stars within dusty regions, offering new insights into stellar nurseries and the complex history of this peculiar galaxy.

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#arp-263 #galaxy-merger #irregular-galaxy

space-and-astronomy1 month ago•56 min saved

Mars' southern mantle runs hotter, reshaping its interior story

New gravity data analyzed with tidal tomography from three NASA Mars missions (MGS, Mars Odyssey, MRO) show the southern hemisphere’s mantle is 200–400 C warmer than the north, possibly partly molten. This non-symmetric interior helps explain Mars’s pronounced north–south dichotomy and has implications for its volcanic and magnetic history, hydrology, and crustal evolution. The finding, published in Nature, points to future missions probing the planet’s interior.

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#gravity #mantle #mars

space-and-astronomy1 month ago•54 min saved

Mars Jellyfish Photo Explained: A Cosmic-Ray Glitch, Not a Creature

A jellyfish-shaped shadow spotted in a 2023 Curiosity NavCam image is not a real Martian organism but a cosmic-ray artifact hitting the camera sensor; such glitches are common on Mars due to its thin atmosphere and lack of a global magnetic field, and are typically seen in a single frame or a few frames, not on the surface. NASA/JPL notes that without detailed imaging analysis, the anomaly is best explained as a camera artifact rather than evidence of life.

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#camera-artifact #cosmic-rays #curiosity

space-and-astronomy1 month ago•60 min saved

Giant space mirrors could turn night into daylight, astronomers warn

A Space.com study on Reflect Orbital’s plan to deploy space mirrors finds that a single 60-by-60-foot mirror would cast a beam roughly 3.4 miles wide that appears 40 times brighter than the full Moon to observers in its path, turning the night sky into a twilight zone and washing out stars within the beam. The glow would extend up to about 50 miles from the beam, and could brighten the sky above the horizon for many miles in the beam’s direction, depending on conditions. If 40,000 mirrors were launched, the combined light could be 10,000 times brighter than the full Moon, creating daytime-like brightness that could hinder astronomy, even as proponents tout potential uses for nighttime solar power and disaster illumination. The FCC licensed a demonstration satellite (EARENDIL-1) for this concept, prompting objections from astronomers and environmental groups; Reflect Orbital argues that only a fraction would be active and that coordination with NSF and independent researchers is planned. The debate highlights a tension between space-led lighting/testing and preserving dark skies for astronomy.

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#astronomy #light-pollution #reflect-orbital

space-and-astronomy1 month ago•48 min saved

China Delays Chang’e-7 Moon Mission, Emphasizing Safety Over Timelines

China’s China Manned Space Agency said the Chang’e-7 lunar mission will be postponed as launch conditions were not met, highlighting prudence and the goal of absolute mission success. Weather factors (including Typhoon Narra) and potential technical issues are cited, reflecting a broader, safety-focused sprint in the Moon race against NASA’s Artemis program that is likely to extend beyond this year in pursuit of a permanent lunar presence.

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#artemis-program #change-7 #china-manned-space-agency

space-and-astronomy1 month ago•45 min saved

China delays Chang'e-7 lunar mission to ensure absolute success

China announced the postponement of the Chang’e-7 lunar mission, saying it did not meet launch conditions for this year’s window. The mission, planned to launch from the Wenchang Space Launch Site on Hainan, aimed to explore permanently shadowed lunar craters, search for water ice, and conduct environmental and resource surveys as part of China’s lunar program. The decision emphasizes prudence to ensure absolute success, with no new launch date disclosed yet.

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#change-7 #china-manned-space-agency #launch-conditions

space-and-astronomy1 month ago•48 min saved

Dense mega-Earth GJ 523b challenges planetary norms with thin atmosphere

Astronomers have identified GJ 523b, a dense 'mega-Earth' about 2.5 times Earth in size and around 23 times as massive, with a surprisingly thin atmosphere. Discovered by NASA’s TESS and examined with the WIYN telescope and the James Webb Space Telescope, the planet’s high density and lack of a thick gaseous envelope defy simple formation models, leading researchers to speculate that extreme heat or a past planetary collision stripped away much of its atmosphere and to push for a clearer definition of the Mega-Earth category.

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#atmosphere-loss #exoplanets #gj-523b

space-and-astronomy1 month ago•58 min saved

Webb spots solar-system-sized dot likely a black hole star from the dawn of the universe

The James Webb Space Telescope identified MoM-BH*-1, a solar-system-sized, ruby-red dot seen about 660 million years after the Big Bang, proposed as a new object class: a black hole star—a dense shell of gas around a massive black hole. If confirmed, it would be the strongest evidence yet for this type of object and could help explain the enigmatic “little red dots” JWST has found. The object may host up to ~100,000 solar masses, with its Balmer-break spectrum indicating a dust-free, hydrogen/helium gas cocoon rather than ordinary starlight; further observations and modeling are needed to verify this interpretation.

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#black-hole-star #early-universe #james-webb-space-telescope

space-and-astronomy1 month ago•55 min saved

Triple black holes in a distant galaxy reveal rapid early-universe growth

Astronomers using the JWST have identified three active black holes in the distant galaxy J0148-4214, about 12.5 billion light-years away. Two lie at the core (80 million and 600,000 solar masses) and are 620 light-years apart, while a third, ~2 million solar masses, sits ~5,500 light-years away and may merge with the pair or escape. The system supports rapid black-hole growth in the early universe via mergers and foreshadows future low-frequency gravitational-wave detections by space-based observatories like LISA.

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#black-holes #galaxy-mergers #gravitational-waves

space-and-astronomy1 month ago•53 min saved

Magnetar Lights Up Space-Time: First Clear Proof of Vacuum Birefringence

Observations of a highly magnetic magnetar (1E 1547-5408) with NASA’s IXPE show X-ray polarization nearly three times higher than typical neutron-star emission and aligned with the star’s magnetic field, providing the strongest evidence yet that vacuum birefringence occurs—empty space acting like a prism under extreme magnetic fields. This long-predicted quantum effect, rooted in Heisenberg and Euler’s work from 1936, tests quantum electrodynamics in nature’s most extreme laboratories and motivates future missions (e.g., GoSOX) to confirm the finding.

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#ixpe #magnetar #polarization

space-and-astronomy1 month ago•48 min saved

Webb Uncovers a Black Hole Star: The Cosmos’ New Object Class

Using the James Webb Space Telescope, scientists have identified MoM-BH*-1—a black hole star about 100,000 solar masses formed less than 700 million years after the Big Bang. Its center is a black hole that relentlessly accretes matter, emitting about 100 billion times more energy than a typical star, while a dense gas shell makes it appear star-sized. The finding suggests other so-called 'Little Red Dots' could be black hole stars, potentially reshaping our understanding of early galaxies and black hole growth.

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#astronomy #black-holes #early-universe

space-and-astronomy1 month ago•55 min saved

Pluto’s atmosphere begins to freeze out as it drifts farther from the Sun

Astronomers report Pluto’s nitrogen-rich atmosphere is starting to freeze out as it moves away from the Sun, with atmospheric pressure dropping about 16% between mid-2021 and 2023. Pluto’s surface runs at roughly -382°F while the upper atmosphere sits around -333°F, conditions that favor frost formation as the air cools. Observations of ten stellar occultations from 2017–2023 show haze in the lower atmosphere settling toward lower latitudes as pressure falls. The findings, led by Amanda Sickafoose, suggest the atmosphere will not be fully frozen by aphelion (2114) but should rebuild somewhat as Pluto travels back toward the Sun. The study was published July 31 in the Planetary Science Journal.

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#atmosphere #frost #nitrogen

space-and-astronomy2 months ago•49 min saved

JWST imagery hints the 'little red dots' are distant galactic cores, not new objects

New JWST imagery suggests the enigmatic 'little red dots' seen in deep-field images are likely ordinary distant galaxies whose bright centers outshine the rest, rather than a new class of object. Researchers used the nearby spiral galaxy Saguaro (about 3.3 billion years after the Big Bang) to model how such galaxies would look at earlier epochs, showing that LRDs could be early-universe galaxies with active nuclei and offering clues about how galaxies and their central black holes grew over cosmic time.

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#black-holes #galaxy-evolution #james-webb-space-telescope