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The Daily Cosmos


The Daily Cosmos


Location: #science
Members: 56
Latest Activity: 11 hours ago


Cosmology - Astrophysics - Astronomy


Hubble Wallpaper - Awesome Hubble Images

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Starts With A Bang

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Comment by Mrs.B 11 hours ago

That's interesting.

Comment by Stephen 13 hours ago

Comment by Mrs.B yesterday

Excellent pics!

Comment by doone yesterday

Galaxy UGC 1810 is 300 million light years away

Comment by doone yesterday

Earth in a few billion years. So stop complaining about the Florida heat people!

Comment by Stephen on Friday

Olena Shmahalo/Quanta Magazine

Olena Shmahalo/Quanta Magazine

A Cosmic Burst Repeats, Deepen­ing a Mystery

“A minor point of interest regarding the Spitler Burst.” The email subject line popped up on Shami Chatterjee’s computer screen just after 3 in the afternoon on Nov. 5, 2015.

When Chatterjee read the email, he first gasped in shock — and then sprinted out of his Cornell University office and down the corridor to tell a colleague. Twenty-eight minutes later, when he started to draft a reply, his inbox was already buzzing. The email thread grew and grew, with 56 messages from colleagues by midnight.

For nearly a decade, Chatterjee and other astrophysicists on the thread had been trying to understand the nature of short, superenergetic flashes of radio waves in space. These “fast radio bursts,” or FRBs, last just a few milliseconds, but they are the most luminous radio signals in the universe, powered by as much energy as 500 million suns. The first one was spotted in 2007 by the astronomer Duncan Lorimer, who together with one of his students stumbled upon the signal accidentally in old telescope data; at the time, few believed it. Skeptics suspected interference from mobile phones or microwave ovens. But more and more FRBs kept showing up — 26 have been counted so far, including the Spitler burst, detected by the astronomer Laura Spitler in data from 2012 — and scientists had to agree they were real.

The question was, what causes them? Researchers sketched dozens of models, employing the gamut of astrophysical mysteries — from flare stars in our own galaxy to exploding stars, mergers of charged black holes, white holes, evaporating black holes, oscillating primordial cosmic strings, and even aliens sailing through the cosmos using extragalactic light sails. For scientists, the FRBs were as blinding as flash grenades in a dark forest; their power, brevity and unpredictability simply made it impossible to see the source of the light.

Read more= read:

Comment by Mrs.B on Friday


Comment by doone on Friday

Scientists think parallel universe crashing into our own created ga...

Ottawa Citizen  - ‎3 hours ago‎
A curious chilly area of space may have been created when a parallel universe crashed into our own, scientists have suggested - the first evidence that we may be part of a multiverse.
Comment by Mrs.B on May 13, 2017 at 6:35pm

AHA......I KNEW it wasn't my fault......its the galaxy's fault!!!

Comment by Stephen on May 13, 2017 at 6:31pm

HST. . Bulge Formations. .
Just as many people are surprised to find themselves packing on unexplained weight around the middle, astronomers find the evolution of bulges in the centres of spiral galaxies puzzling. A recent NASA/ESA Hubble Space Telescope image of NGC 4710 is part of a survey that astronomers have conducted to learn more about the formation of bulges, which are a substantial component of most spiral galaxies.

When targeting spiral galaxy bulges, astronomers often seek edge-on galaxies, as their bulges are more easily distinguishable from the disc. This exceptionally detailed edge-on view of NGC 4710 taken by the Advanced Camera for Surveys (ACS) aboard Hubble reveals the galaxy's bulge in the brightly coloured centre. The luminous, elongated white plane that runs through the bulge is the galaxy disc. The disc and bulge are surrounded by eerie-looking dust lanes.

When staring directly at the centre of the galaxy, one can detect a faint, ethereal "X"-shaped structure. Such a feature, which astronomers call a "boxy" or "peanut-shaped" bulge, is due to the vertical motions of the stars in the galaxy's bar and is only evident when the galaxy is seen edge-on. This curiously shaped puff is often observed in spiral galaxies with small bulges and open arms, but is less common in spirals with arms tightly wrapped around a more prominent bulge, such as NGC 4710.

NGC 4710 is a member of the giant Virgo Cluster of galaxies and lies in the northern constellation of Coma Berenices (the Hair of Queen Berenice). It is not one of the brightest members of the cluster, but can easily be seen as a dim elongated smudge on a dark night with a medium-sized amateur telescope. In the 1780s, William Herschel discovered the galaxy and noted it simply as a "faint nebula". It lies about 60 million light-years from the Earth and is an example of a lenticular or S0-type galaxy – a type that seems to have some characteristics of both spiral and elliptical galaxies.

Astronomers are scrutinising these systems to determine how many globular clusters they host. Globular clusters are thought to represent an indication of the processes that can build bulges. Two quite different processes are believed to be at play regarding the formation of bulges in spiral galaxies: either they formed rather rapidly in the early Universe, before the spiral disc and arms formed; or they built up from material accumulating from the disc during a slow and long evolution. In this case of NGC 4710, researchers have spotted very few globular clusters associated with the bulge, indicating that its assembly mainly involved relatively slow processes.

Credit : NASA and ESA



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