Not long ago, the center of the Milky Way exploded

An artist's impression of the massive bursts of ionizing radiation exploding from the center of the Milky Way and impacting the Magellanic Stream.

A titanic, expanding beam of energy sprang from close to the supermassive black hole in the centre of the Milky Way just 3.5 million years ago, sending a cone-shaped burst of radiation through both poles of the Galaxy and out into deep space.That's the finding arising from research conducted by

Will Andromeda start consuming the Milky Way?

Andromeda: our nearest large galactic neighbour.

Scientists have now charted the cannibalistic past of the neighboring galaxy to our own - Andromeda. The large galaxy now appears to have sights set on the Milky Way as its next main target.By pulling together big data, astronomers have figured out that Andromeda has, over time, consumed several smaller

Two Unusual Galaxies Shake Up the Dark Matter Debate, Again

Astronomers have found two galaxies that appear devoid of dark matter, which they argue is in fact strong evidence of the elusive particle's existence.

When it comes to the nature of dark matter, astronomers are still largely, well, in the dark. The existence of this mysterious substance was hypothesized more than 40 years ago to explain discrepancies between the calculations of how galaxies ought to behave, based on their mass, and what was actually

Decade long study sheds light on “killer” galactic mergers

Two merging galaxies known as Arp 302, also called VV 340

Images taken by NASA's Spitzer Space Telescope are providing insight into the phenomenon of "killer" galaxies that, when they merge, shut down star formation within the new united galaxies. The collision and mixing of a pair of galaxies under the right (or wrong) conditions can disrupt the processes that allow

Ghostly Galaxies Hint at Dark Matter Breakthrough

The bizarre galaxy NGC 1052-DF2, a diffuse collection of stars, gas and dust that is apparently devoid of dark matter.

Much as a ripple in a pond reveals a thrown stone, the existence of the mysterious stuff known as dark matter is inferred via its wider cosmic influence. Astronomers cannot see it directly, but its gravity sculpts the birth, shape and movement of galaxies. This makes a discovery from last

Oddball Galaxy Puts Dark Matter Theory to the Test

Dark Matter

A small, faint galaxy residing some 65 million light-years away has been threatening to upend scientists’ entire paradigm of dark matter—the supposedly ubiquitous particles thought to pervade the universe like a hidden cosmic skeleton. All galaxies should be surrounded by a more massive cloud of dark matter, the thinking goes,

Einstein’s Greatest Theory Validated on a Galactic Scale

Einstein’s theory

Three years ago astrophysicist Tom Collett set out to test a theory. Not just any theory, but one that sets scientists’ expectations for how the universe operates at large: Einstein’s general relativity. First published in 1915, the theory mathematically describes how gravity emerges from the fundamental geometry of space and