Due to the special gravitational lens effect where light is bent as it passes heavy objects, such as galaxy clusters, a group of physics students at the Niels Bohr Institute observed a quasar whose ...

For the first time, astronomers have directly measured a solar-system-size corona around a distant supermassive black hole, ...

For the first time, astronomers have seen the image of a distant quasar split into multiple images by the effects of a cloud of ionized gas in our own Milky Way Galaxy. Such events were predicted as ...

Jan. 23 (UPI) --The Hubble constant is the rate at which the universe is expanding. Through the decades, astronomers have developed more reliable ways to estimate the value of the Hubble constant, but ...

The most unique feature in a new image taken with the NASA/ESA Hubble Space Telescope is a group of five quasar images produced by a process called gravitational lensing, in which the gravitational ...

Quasars are the bright centers of young galaxies powered by supermassive black holes. Most quasars are very distant and faint, making them difficult to observe. One quasar, 0957+561, is ...

With the help of machine-learning techniques, a team of astronomers has discovered a dozen quasars that have been warped by a naturally occurring cosmic “lens” and split into four similar images.

Using the ESO 3.6-m telescope at La Silla (Chile), an international team of astronomers 1 has discovered a complex cosmic mirage in the southern constellation Crater (The Cup). This "gravitational ...

Astronomers have seen something they did not expect: an Einstein Cross with not just the standard four images, there was an extra one. This unprecedented present might allow astronomers to better ...

Four of the newfound quadruply imaged quasars are shown here: From top left and moving clockwise, the objects are: GraL J1537-3010 or "Wolf's Paw;" GraL J0659+1629 or "Gemini's Crossbow;" GraL ...

The Cloverleaf quasar, a 17th-magnitude object, exhibits quadruply lensed images due to gravitational lensing by an intervening galaxy. X-ray observations reveal brightness discrepancies among the ...