At present, the formation of galaxies is difficult to understand without the presence of a ubiquitous, but mysterious component, termed dark matter. Astronomers have measure how much dark matter there is around galaxies, and have found that it varies between 10 and 300 times the quantity of visible matter. However, a few years ago, the discovery of a very diffuse object, named Dragonfly 44, changed this view. It was found that this galaxy has 10,000 times more dark matter than the stars. Taken back by this finding, astronomers have made efforts to see whether this object is really anomalous, or whether something went wrong in the analysis of the observations. Now we have the answer.
An international team led by the Kapteyn Institute of the University of Groningen (the Netherlands), with participation by the Instituto de Astrofísica de Canarias (IAC) and the University of La Laguna (ULL), has found that
A star 215 million light-years away has been obliterated by a supermassive black hole, making it the closest observation to date of stellar spaghettification.
Spaghettification doesn’t sound very scientific, but it’s a fairly accurate description of what actually happens.
A doomed star caught in the orbit of a supermassive black hole will eventually hit a kind of gravitational sweet spot that turns everything to shit. No longer capable of keeping its physical integrity, the star begins to rapidly collapse in a process known as a fast-evolving tidal disruption event. When this happens, stellar debris bursts out from the star, forming a long, thin stream, half of which gets sucked toward the black hole; the other half is blown back into space. The thin stream eventually catches up to and slams into itself, releasing energy and
It’s one of those astounding events that sounds like science fiction, but is just plain science. Astronomers say they were able to capture in unprecedented detail the process of a star being ripped into strips and devoured by a black hole.
The powerful phenomenon caught the attention of scientists when a new blast of light near a known supermassive black hole was spotted by telescopes around the world. Months worth of follow-up observations made it clear they were seeing the destruction of a far-off sun as it happened.
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“In this case the star was torn apart with about half of its mass feeding — or accreting — into a black hole of one million times the mass of the sun, and
Astronomers at the European Southern Observatory observed a black hole sucking in a faraway star, shredding it into thin strands of stellar material.
This process, known as “spaghettification,” happens because of black holes’ powerful gravitational force.
At 215 million light-years away, this spaghettification process is the closest ever observed by astronomers.
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Astronomers have captured a rarely-seen event: a flare of light caused by a black hole devouring a nearby star like spaghetti.
Observed in the Eridanus constellation, about 215 million light-years away from Earth, the star’s destruction is the closest such event astronomers have ever observed.
“When an unlucky star wanders too close to a supermassive black hole in the center of a galaxy, the extreme gravitational pull of the black hole shreds the star into thin streams of material,” study author Thomas Wevers, a fellow at the European Southern Observatory in Santiago,
When two neutron stars smashed into each other, about 130 million light-years from Earth, the universe lit up. The collision, between some of the densest objects in the cosmos, produced gravitational waves and a spattering of fireworks on Aug. 17, 2017. Dozens of telescopes on Earth captured the rare merger across different wavelengths of the electromagnetic spectrum. First, there came a burst of highly energetic gamma rays, followed by bursts of light and UV, radio and infrared signals.
It’s been three years since the landmark detection of a neutron star merger from gravitational waves. And since that day, an international team of researchers led by University of Maryland astronomer Eleonora Troja has been continuously monitoring the subsequent radiation emissions to provide the most complete picture of such an event.
Their analysis provides possible explanations for X-rays that continued to radiate from the collision long after models predicted they would stop. The study also reveals
Astronomers from The University of Western Australia’s node of the International Center for Radio Astronomy Research (ICRAR) have developed a new way to study star formation in galaxies from the dawn of time to today.
“Stars can be thought of as enormous nuclear-powered processing plants,” said lead researcher Dr. Sabine Bellstedt, from ICRAR.
“They take lighter elements like hydrogen and helium, and, over billions of years, produce the heavier elements of the periodic table that we find scattered throughout the universe today. The carbon, calcium and iron in your body, the oxygen in the air you breathe, and the silicon in your computer all exist because a star created these heavier elements and left them behind,” Bellstedt said. “Stars are the ultimate element factories in the universe.”
Understanding how galaxies formed stars billions of years ago requires the
Scientists have used gravitational lensing to detect a so-called ‘rogue planet’ that doesn’t orbit a star and floats freely in space.
The planet is relatively small, but researchers can’t tell for certain how far away it is from Earth.
It’s possible that the Milky Way is home to trillions of these free planets.
We think of our solar system as typical, or even “normal,” but in the universe, there’s really no such thing as normal. So many circumstances exist with regard to planets, stars, moons, and other objects that there’s no clear arrangement that the cosmos favors over any other, and there are even free-floating “rogue planets” that have escaped the systems they developed in and are just sort of doing their own thing.