Galactic Astronomy

What Exactly is the (dark) Matter with Euclid?

Artist impression of the Euclid mission in space. The spacecraft is white and gold and consists of three main elements: a flat sunshield, a large cylinder where the light from space will enter, and a 'boxy' bottom containing the instruments. The spacecraft is shown half in the shadow, because the sunshield will always be...

Elusive Intermediate-mass Black Holes Take Bites From Stars and Expel the Contents

This artist’s impression depicts a star being torn apart by an intermediate-mass black hole, surrounded by an accretion disk. Image credit: Hubble / NASA / ESA / M. Kornmesser.According to space experts, there is a possibility of the existence of intermediate-mass black holes. These are black holes that can consume some of the stray...

The Current Discovery Sheds Light On Very Early Supermassive Black Holes

This system consists of a pair of galaxies, dubbed IC 694 and NGC 3690, which made a close pass some 700 million years ago. As a result of this interaction, the system underwent a fierce burst of star formation. In the last fifteen years or so six supernovae have popped off in the outer...

Dozens of Variable Stars Were Spotted in the Open Cluster NGC 6611

A 30' × 30' fragment of the DSS-1 plate containing the observed fields of NGC 6611. Credit: Michalska et al, 2023Astronomers have used three ground-based telescopes in Chile to search for variable stars in the open cluster NGC 6611. They identified 95 variable stars, most of which are likely cluster members. This discovery was...

Astronomers Identify Twenty Ultraviolet-Emitting Supernova Remnants in the Andromeda Galaxy

Positions of the 20 SNRs with detected diffuse UV emission (red squares) and of the 5 SNRs with likely, but confused, diffuse emission (blue squares), overlaid on the image of the Andromeda Galaxy in the F148W filter. Credit: Leahy et al, 2023Utilizing the AstroSat satellite, astronomers from the University of Calgary, Canada, have identified...

How Supermassive Fuel-Hungry Black Holes Feed off Intergalactic Gas

Two interacting galaxies viewed from the Hubble Space Telescope. Credit: NASA/ESA/Hubble Heritage TeamA research study led by the College of Southampton has shown how supermassive black holes (SMBHs) are feeding off gas clouds that reach them by traveling hundreds of thousands of light yrs from one galaxy to another.A worldwide team of scientists has...

Flashes on the Sun Could Aid Researchers in Predicting Solar Flares

Two images of a solar active region (NOAA AR 2109) taken by SDO/AIA show extreme-ultraviolet light produced by million-degree-hot coronal gas (top images) on the day before the region flared (left) and the day before it stayed quiet and did not flare (right). The changes in brightness (bottom images) at these two times show...

New Study Reveals a Wide Diversity of Galaxies in the Early Universe

Credit: Unsplash/CC0 Public DomainNew information from the James Webb Space Telescope (JWST) have revealed that the structures of galaxies in the early universe were much more diverse and also mature than previously known. Researchers recently compared photos of hundreds of galaxies taken by JWST for the Cosmic Evolution Early Release Science (CEERS) Survey with...

Stunning James Webb Space Telescope Image Transforms a Distant Galaxy Into a Sparkling Christmas Ornament

JWST's new image of NGC 7469. (ESA/Webb, NASA & CSA, L. Armus, A. S. Evans)The perfect galaxy photoThe James Webb Space Telescope simply gave a spiral galaxy 230 million light-years away a recent sparkling glamor shot excellent sufficient for the Christmas tree.While the galaxy has the instead un-attractive name of NGC 7469, it has been...

Webb Captures Luminous, Face-on Spiral Galaxy NGC 7469

Credit: ESA/Webb, NASA & CSA, L. Armus, A. S. EvansThe photo of the monthWebb's photo of the month for December is dominated by NGC 7469, a luminous, face-on spiral galaxy approximately 90,000 light-years in diameter that lies roughly 220 million light-years from Earth in the constellation Pegasus.This spiral galaxy has recently been studied as...