91av

Galaxies

Space

We may have finally solved cosmology’s chicken-or-the-egg problem

Galaxies and their supermassive black holes evolve together, but which came first is an ongoing question. Now we may finally have an answer, says columnist Leah Crane

Comment

Space

A cosmic case of mistaken identity that can only be solved right now

Comment

Space

What is a galaxy? That’s a surprisingly difficult question to answer

Comment

Space

A huge cloud of dark matter may be lurking near our solar system

News
Dark Matter distribution

Space

The best map of dark matter has revealed never-before-seen structures

News
little red dots

Space

Distant ‘little red dot’ galaxies may contain baby black holes

News
This new NASA/ESA/CSA James Webb Space Telescope Picture of the Month features a rare cosmic phenomenon called an Einstein ring. What at first appears to be a single, strangely shaped galaxy is actually two galaxies that are separated by a large distance. The closer foreground galaxy sits at the center of the image, while the more distant background galaxy appears to be wrapped around the closer galaxy, forming a ring.?? Einstein rings occur when light from a very distant object is bent (or ???lensed???) about a massive intermediate (or ???lensing???) object. This is possible because spacetime, the fabric of the Universe itself, is bent by mass, and therefore light travelling through space and time is bent as well. This effect is much too subtle to be observed on a local level, but it sometimes becomes clearly observable when dealing with curvatures of light on enormous, astronomical scales, such as when the light from one galaxy is bent around another galaxy or galaxy cluster. When the lensed object and the lensing object line up just so, the result is the distinctive Einstein ring shape, which appears as a full circle (as seen here) or a partial circle of light around the lensing object, depending on the precision of the alignment. Objects like these are the ideal laboratory in which to research galaxies too faint and distant to otherwise see. The lensing galaxy at the center of this Einstein ring is an elliptical galaxy, as can be seen from the galaxy???s bright core and smooth, featureless body. This galaxy belongs to a galaxy cluster named SMACSJ0028.2-7537. The lensed galaxy wrapped around the elliptical galaxy is a spiral galaxy. Even though its image has been warped as its light travelled around the galaxy in its path, individual star clusters and gas structures are clearly visible. The Webb data used in this image were taken as part of the Strong Lensing and Cluster Evolution (SLICE) survey (programme 5594), which is led by Guillaume Mahler at University of

Space

I’m calling it – 2026 is going to be the year of the galaxy

Comment

Space

Weird clump in the early universe is piping hot and we don’t know why

News
The supernova remnant Cassiopeia A

Space

Odd elements in supernova blast might have implications for alien life

News

Space

Supermassive dark matter stars may be lurking in the early universe

Stars powered by dark matter instead of nuclear fusion could solve several mysteries of the early universe, and we may have spotted the first hints that they are real

News

Space

Astronomers may have glimpsed evidence of the biggest stars ever seen

News

Space

Mystery deepens as isolated galaxy forms stars with no obvious fuel

News

Space

A distant galaxy is being strangled by the cosmic web

News

Space

Brightest black hole flare ever caused by huge star being ripped apart

News