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Category: cosmology – Page 418

This mysterious space object is baffling astronomers all over the world

The flash was about ten times brighter than a normal supernova.

Two telescopes that are part of the ATLAS project in Hawaii have discovered an unnaturally bright explosion in the sky.

The discovery, made in mid-June, was published in Astronomer’s Telegram, where the object was assigned the name AT2018cow or “The Cow” for short.

Astronomers all over the world quickly got wind of the discovery and focused their telescopes onto the area in which the object was discovered. So far, at least 24 telescopes have examined the object more closely — and yet it’s still not clear what the explosion was caused by.

Astronomers observe the magnetic field of the remains of supernova 1987A

For the first time, astronomers have directly observed the magnetism in one of astronomy’s most studied objects: the remains of Supernova 1987A (SN 1987A), a dying star that appeared in our skies over thirty years ago.

In addition to being an impressive observational achievement, the detection provides insight into the early stages of the evolution of supernova remnants and the cosmic magnetism within them.

“The magnetism we’ve detected is around 50,000 times weaker than a fridge magnet,” says Prof. Bryan Gaensler. “And we’ve been able to measure this from a distance of around 1.6 million trillion kilometres.”

Dark Matter ‘Test’ Will Either Prove Its Existence or Modify Gravity

For something that supposedly takes up 80 percent of the total mass of the universe, we don’t know a whole lot about dark matter. Sometimes the lightless stuff reveals hints about its shape; other times it completely thwarts any evidence supporting its existence. Since we can’t observe it first-hand, we rely on indirect means to suss out information about it, like watching the interactions between other forms of matter. Now, scientists have developed a new “test” to make those investigations more definitive, leading us closer to answering the question: Is dark matter even real? And if it’s not, then is everything we know about gravity wrong?

In a study, published Monday in Physical Review Letters, a team of scientists from the University of Bonn that also includes Hubble Fellow Marcel S. Pawlowski, Ph.D. of the University of California, Irvine, introduce a computer model that can simulate how certain small galaxies should move if dark matter exists. Though dark matter does not absorb or emit light, it still interacts with visible matter through gravity, so it’s expected to make the stars around galaxies move in specific ways.

Pawlowski explains to Inverse in an email that within the little galaxies in question — satellite “dwarf” galaxies, crowding around the edges of big galaxies like the Milky Way — the acceleration of stars speeding around the galaxy’s center is described by a term called the radial acceleration relation, or RAR. “With the new study, we simulate such dwarf galaxies under the assumption of the ‘standard’ dark matter model, [to] determine what kind of behavior would be expected for the dwarfs,” he says. “We find that the simulated dwarf galaxies largely continue the RAR to lower accelerations.” Now that they know how those dwarf galaxies are supposed to move if dark matter exists, they can compare the simulations to real-life data on the movement of those galaxies.

Why the James Webb telescope launch could be the most exciting astrological event of the millennia

The NASA James Webb telescope could prove to be the biggest leap forward to humankind’s exploration into deep space.

The Webb telescope will give us the ability to investigate the cosmos, unlocking secrets from the beginning of the Big Bang to how galaxies are formed and beyond, bringing us light years ahead of our current understanding of planetary evolution.

What is the james webb telescope?

Scientists Detect Possible Missing ‘Piece’ Of Universe Created By The Big Bang

Aside from dark matter and the dark energy that comprised the universe, there remained to be 5 percent of what was called the “ordinary matter.” About two-thirds of this ordinary matter was left unaccounted for until now. ( Harvard-Smithsonian Center for Astrophysics )

After a 20-year-long experiment, a team of international scientists detects the last of the missing intergalactic material predicted to be created by the Big Bang.

Specifically, the team was finally able to detect the missing parts of the “ordinary matter” that makes up everything in the universe, from the stars to the cores of black holes. This ordinary matter is different from the “dark matter” that comprised the bulk of the universe’s mass. The dark matter remained to be undetected until now.

Did Scientists Just Find a Missing Piece of the Universe?

It would be silly to think we completely understand our universe, given how small the Earth is compared to the vastness of the cosmos. But from here on our tiny planet, it appears that much of the universe is missing. And I’m not just talking about dark matter. Regular stuff seems to be missing, too.

Astronomy fans probably know that as far as humans can tell, the universe is composed mostly of some mysterious, unexplained energy called dark energy that pushes it apart. The remaining piece, about a quarter, is dark matter, another unexplained thing that seems to build the universe’s skeleton. Just 4 percent is the regular matter that we can see: stars, planets, and interstellar and intergalactic gas. But the observed amount of this regular matter still falls perhaps a third short of the amount of stuff that physicists think should exist based on their models of the universe.

Can Thousands of Smartphones Help Detect Cosmic Rays?

Your smartphone has a particle detector on it, and scientists want you to help them uncover how the universe really works and maybe even discover the true nature of dark matter. There are just a few bugs to work out.

High-energy particles from space, called cosmic rays, constantly bombard the Earth. There are all sorts of things we might be able to learn about the universe by studying those particles. We’ve previously discussed high-tech, expensive equipment used to monitor them. But the physicists behind a new project want your smartphone to help gather data on these cosmic rays, hopefully revealing new insights into dark matter and other strange phenomena.

“This project can only be successful with a large number of people,” Piotr Homola, associate professor at the Institute of Nuclear Physics at the Polish Academy of Sciences, told Gizmodo. “We need public engagement on an unprecedented scale.”

Astronomers See Distant Eruption as Black Hole Destroys Star

For the first time, astronomers have directly imaged the formation and expansion of a fast-moving jet of material ejected when the powerful gravity of a supermassive black hole ripped apart a star that wandered too close to the massive monster.

The scientists tracked the event with radio and infrared telescopes, including the National Science Foundation’s Very Long Baseline Array (VLBA) and NASA’s Spitzer Space Telescope, in a pair of colliding galaxies called Arp 299. The galaxies are nearly 150 million light-years from Earth. At the core of one of the galaxies, a black hole 20 million times more massive than the Sun shredded a star more than twice the Sun’s mass, setting off a chain of events that revealed important details of the violent encounter. The researchers also used observations of Arp 299 made by NASA’s Hubble space telescope prior to and after the appearance of the eruption.

Only a small number of such stellar deaths, called tidal disruption events, or TDEs, have been detected. Theorists have suggested that material pulled from the doomed star forms a rotating disk around the black hole, emitting intense X-rays and visible light, and also launches jets of material outward from the poles of the disk at nearly the speed of light.