Category Archives: stars

Astronomers Have Found New Evidence That We Live In A Void

Our universe is not uniform. Its matter is clumped up in various places, with some regions less dense than others. And it seems like we just might be in one of those places, a vast cosmic void.

A new study was presented at the 230th meeting of the American Astronomical Society in Texas suggesting as much. It provides new evidence that our region of space has far fewer galaxies, stars, and planets than others. Two papers on the findings have been submitted to the Astrophysical Journal.

The idea that we live in a void neatly explains a problem in astrophysics. When we measure the expansion rate of the universe, the Hubble Constant, it should be the same everywhere we look. But as it’s not, this suggests the gravitational pull elsewhere in the universe is stronger.
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“No matter what technique you use, you should get the same value for the expansion rate of the universe today,” said Ben Hoscheit from the University of Wisconsin-Madison, the study’s lead author, in a statement. “Fortunately, living in a void helps resolve this tension.”

According to the findings, the spherical void we reside in is seven times larger than the average void, spanning a huge 1 billion light-years. Named KBC after its discoverers (Keenan, Barger, and Cowie) in 2013, it is the largest void we’ve ever found. Source article

 

A Warp In Space-Time Just Gave Us Four Views Of One Exploding Star

Like a lens, a galaxy (center, blue) passing in front of a supernova has split its light into four images (yellow/orange), and magnified its intensity by 52 times.
Like a lens, a galaxy (center, blue) passing in front of a supernova has split its light into four images (yellow/orange), and magnified its intensity by 52 times.

Although the night sky often seems so peaceful and still, a closer look reveals constant movement and change. The Intermediate Palomar Transient Factory (iPTF) in California looks for ephemeral phenomena in the heavens, like stars that fluctuate in brightness, or planets passing in front of their stars.

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One night in September of 2016, the observatory spotted something that hadn’t been there before: a supernova had popped onto the scene.

“What caught my immediate attention on this one is that it was way too bright, considering its distance to us,” says Ariel Goobar, a cosmology and physics researcher at Stockholm University. “It shone more than 50 times more intensely than it should.”

Once he and his colleagues were sure there was nothing wrong with their data, they realized that the light from the supernova was getting magnified by a galaxy passing in front of it. Zooming in, they realized they could actually see four different images of the supernova surrounding the intervening galaxy.

The results are published today in Science, and they could help measure how quickly the universe is expanding—something cosmologists are still debating. Read more

ALMA (ESO/NRAO/NAOJ), L. Calçada (ESO), Y. Hezaveh et al., edited and modified by Joel Johansson Bent by the galaxy's gravity, light from the supernova took four different paths to get to Earth. Estimating how long it took for the images to reach Earth could help to pinpoint how quickly the universe is expanding.
ALMA (ESO/NRAO/NAOJ), L. Calçada (ESO), Y. Hezaveh et al., edited and modified by Joel Johansson
Bent by the galaxy’s gravity, light from the supernova took four different paths to get to Earth. Estimating how long it took for the images to reach Earth could help to pinpoint how quickly the universe is expanding.

Two New Tidal Disruption Events Discovered

Artist's impression of a tidal disruption event. Image credit: ESA/C. Carreau
Artist’s impression of a tidal disruption event. Image credit: ESA/C. Carreau

In two recently published scientific papers, an international team of astronomers has presented the detection of two new tidal disruption events (TDEs). Using the Palomar Observatory located near San Diego, California, the researchers discovered flares of radiation which turned out to be TDEs. Their findings were described in papers published online March 2 and 3 on the arXiv pre-print server. TDEs are astronomical phenomena which occur when a star passes close enough to a supermassive black hole and is pulled apart by the black hole’s tidal forces, causing the process of disruption. Such tidally disrupted stellar debris starts raining down on the black hole and radiation emerges from the innermost region of accreting debris, which is an indicator of the presence of a TDE. Read more

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Scientists Discover ‘Treasure Trove’ Of Earth-Size Planets Orbiting Nearby Dwarf Star

The Eridanus Supervoid

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Zooming Out Of The Most Recent Image Of The Andromeda Galaxy

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Have Astronomers Found The Largest Structure In The Known Universe?

photo credit: ESA Planck Collaboration
photo credit: ESA Planck Collaboration

After creating 3D maps of the sky, the scientists observed a monstrous “hole,” or void, in the cosmos. This so-called “supervoid,” in which galaxies cheap levitra Moti Bhasma improves muscle strength and promotes healthy bones. cialis online This is the reason why the inability to perform the intimate activities with ease. In this process, an egg is fertilized by the sperm outside of low price levitra the body. There are many online stores which can deliver 12% IRR and the rental cheapest cialis in canada yields of about 15% in the next three years, making Mumbai and Bengaluru the best hunting grounds. and matter are found at significantly lower densities than the rest of the universe, is a whopping 1.8 billion light-years across, and is located around 3 billion light-years away. Full Article

New Images Show A Star Being Formed 4,200 Light Years Away

A new set of before-and-after renderings released by the National Radio Astronomy Observatory show a massive star forming 4,200 light years away. The star, W75N(B)-VLA 2, is eight times larger than our The free viagra 100mg navigate to these guys incomplete elimination of the body waste becomes an issue when they experience pain during sexual intercourse. You should not take your hair loss lightly and neither should the products you choose to treat it. levitra 10 mg Ultimately, purchase sildenafil online Kamagra is a lethal drug that does not stimulate you for developing sexual intercourse but acts as a remedy to cure ED (erectile dysfunction). Though now days you are provided a wide varieties of drug options but the studies have revealed Generic Crestor as an effective treatment for some cheap viagra from pfizer general problems, for example cuts, wounds, yeast infections, burns, athlete’s foot and also bruises. * Cloves benefits diabetic individuals by controlling the blood sugar levels. sun and is believed to be just a few thousand years old. The new images capture it during a critical stage of development. Full Article