#astronomy

A new study suggests Earth may survive the Sun's eventual death, contradicting previous theories that our planet would be engulfed as the Sun expands into a red giant. The research indicates that the Sun's mass loss could cause Earth's orbit to widen enough to escape destruction, though the planet would still become uninhabitable.

A new catalog of stellar rotation periods for over one million stars has been created using TESS data. The resource aids studies of stellar evolution, magnetic activity, and exoplanet host stars.

Delta T (ΔT) is the time difference between Universal Time (UT) and Terrestrial Time (TT), used in astronomical calculations to account for irregularities in Earth's rotation. It has been increasing gradually due to tidal braking and other factors, and historical values are derived from ancient eclipse records.

NASA's Hubble Space Telescope website allows users to see what astronomical image was captured on their birthday by entering the month and date. The tool randomly matches a Hubble observation from any year to the user's birthday, providing a fun way to explore Hubble's discoveries.

The article explains that while the winter solstice marks the shortest day of the year, the rate of daylight increase is not immediately rapid due to the elliptical shape of Earth's orbit and the axial tilt. Around the solstice, the Sun's apparent movement along the horizon is at its slowest, causing the change in daylight hours to be gradual at first before accelerating in the weeks following.

A new study warns that proposed large satellite constellations could severely brighten the night sky, potentially overwhelming natural starlight and disrupting astronomical observations. Researchers estimate that if all planned fleets are deployed, the combined brightness from satellites could exceed that of the natural night sky across much of the planet.

This simulation video shows how the Sun would appear from various locations across the universe, including other planets, distant stars, and galaxies, illustrating changes in size, brightness, and color based on distance and perspective.

The Vera C. Rubin Observatory has begun its decade-long Legacy Survey of Space and Time (LSST), using the world's largest digital camera to repeatedly image the southern sky. This project will create an unprecedented time-lapse cosmic movie to study dark matter, dark energy, and the solar system.

The SETI Institute's Career Center lists employment opportunities, including positions such as Computer Vision Scientist and Telescope Operator. It provides job details, application requirements, and contact information for applicants with disabilities needing accommodations.

Using the James Webb Space Telescope, astronomers have identified a mature galaxy cluster at a much earlier stage in the universe's history than previously observed, challenging existing models of galaxy formation and redefining the period known as "cosmic noon."

A new study suggests Earth might survive the Sun's death when it becomes a red giant in about 5 billion years. Instead of being engulfed, the planet could migrate outward as the Sun loses mass, potentially avoiding destruction—though its surface would become uninhabitable.

The Vera C. Rubin Observatory has officially begun its Legacy Survey of Space and Time (LSST), a decade-long project that will repeatedly image the entire southern sky. Using the world's largest digital camera, the survey aims to revolutionize astronomy by detecting millions of new stars, galaxies, and transient events, including potentially hazardous asteroids.

Researchers released a 450GB subset of the 80TB+ Multimodal Universe dataset, allowing astronomers to crossmatch data from multiple large sky surveys on a standard laptop. The dataset includes curated data from seven major surveys like Euclid, DESI, and Gaia, aiming to democratize access to big-data astronomy for machine learning research.

The article explains what exocomets are—icy bodies orbiting stars other than the Sun—and describes how astronomers detect them using transit observations and spectroscopy. It highlights recent discoveries and the potential of missions like TESS and JWST to find and study more exocomets, offering insights into planetary system formation and composition.

NASA's James Webb Space Telescope has captured a new image of the Cigar Galaxy (Messier 82), revealing approximately 16.5 million stars in unprecedented detail. The image showcases intense star formation and the galaxy's dramatic outflow of gas and dust.

Astronomers found that some supermassive black holes emit bright radio flares years after consuming a star, a delayed effect likened to "burping." Using the Very Large Array, they observed that these flares happen when the black hole's jets later interact with surrounding gas, changing our understanding of tidal disruption events.

Astronomers used the MeerKAT radio telescope to produce the most detailed image yet of the Milky Way's center, revealing supernova remnants, star-forming regions, and structures around the supermassive black hole Sagittarius A*.

The Kalyazin RT-64 radio telescope in Russia plays a key role in deep space communication and tracking, supporting missions to the Moon and beyond as part of Russia's space infrastructure.

A new trend in rail tourism combines scenic train rides with stargazing experiences, offering passengers dark-sky viewing from special railcars or at remote stops. These routes, including in the U.S., Canada, and Europe, are designed to reduce light pollution and provide astronomers with unique access to pristine night skies.

A 20-year time-lapse video shows stars orbiting the supermassive black hole at the center of the Milky Way, known as Sagittarius A*. The footage reveals the stars' orbital paths, providing direct evidence of the black hole's immense gravitational influence.

This video discusses a proposed method for directly imaging exoplanets using the phenomenon of Einstein rings, suggesting that with current or near-future technology, this could be achievable within a human lifetime.

Dark sky lighting reduces light pollution by using shielded, downward-facing fixtures with warm color temperatures, benefiting human health, wildlife, and energy efficiency while maintaining safety and visibility.

A video presents a visual journey from Earth's surface to the scale of cosmic galaxy clusters, illustrating the vast hierarchy of structures in the universe.

NASA's James Webb Space Telescope has captured highly detailed images of the Cigar Galaxy (M82), pinpointing millions of individual stars and revealing the galaxy's intense starburst activity. The observations provide new insights into the chaotic environment of this galaxy, which is forming stars at a rapid rate compared to the Milky Way.

The ESA's Euclid space telescope has captured a detailed image of a dense region near the centre of the Milky Way, revealing hundreds of thousands of stars and complex structures. This observation is part of Euclid's mission to map the dark Universe by surveying billions of galaxies across cosmic time.

The Euclid space telescope has captured the largest and most detailed image yet of the Milky Way's galactic bulge, revealing hundreds of millions of stars in unprecedented clarity. The image covers an area 500 times the size of the full Moon and offers new insights into the structure and star formation in our galaxy's centre.

This PDF guide provides an introduction to celestial navigation, covering key concepts such as the celestial sphere, coordinates, and the use of a sextant to determine position at sea using the Sun, Moon, stars, and planets.

A citizen scientist has discovered a rare bow-and-arrow-shaped radio galaxy, named J0019+1501, using data from the Very Large Array Sky Survey. The unusual double-lobed structure spans about 1.2 million light-years and features a straight jet resembling an arrow, offering new insights into radio galaxy formation and evolution.

NASA's Nancy Grace Roman Space Telescope has arrived at the Kennedy Space Center in Florida, marking a key milestone ahead of its planned launch later this year. The observatory will study dark energy, exoplanets, and infrared astrophysics from space.

Astronomers have identified the source of mysterious repeating fast radio bursts (FRBs) from space, tracing them to a specific type of star system. The findings help narrow down the possible origins of these powerful, enigmatic signals, offering new insights into the extreme environments that produce them.