Fast Radio Bursts: Enigmatic Signals from Across the Universe

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Profile Mr. Kevvy Crowdfunding Project Donor*Special Project $250 donor
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Message 1989526 - Posted: 10 Apr 2019, 17:41:28 UTC - in response to Message 1989525.  
Last modified: 10 Apr 2019, 17:55:28 UTC

... would it be too much to ask to display the text in black on white, rather than white on black? That would be much easier on the eyes, and would avoid most of the wasted ink if we wanted to print a portion for later study.


All modern popular browsers have Accessibility features whereby text colours can be changed for better visibility. Here is a guide on how to do this for Internet Explorer, Firefox, Chrome, Opera and Safari.
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Message 1989754 - Posted: 12 Apr 2019, 8:54:11 UTC - in response to Message 1987623.  

[...] The effect of this expansion on the scale of our solar system, or that of nearby galaxies is negligible.


Negligible, yet still measurable? The effect is still there I presume even though extremely small. Would it ever be possible to directly measure the local expansion of spacetime? Perhaps with the next generation of space-based laser interferometers?
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Message 1993077 - Posted: 8 May 2019, 4:49:17 UTC
Last modified: 8 May 2019, 5:02:24 UTC

Ref https://setiathome.berkeley.edu/forum_thread.php?id=84024&postid=1989405
Observations suggest the Larger and Smaller Magellanic satellite galaxies collided some galactic turns ago, and may have lost stars and even black holes into intergalactic space. Some of those objects leaving probably left at high velocity. We've seen hypervelocity stars in our own galaxy, so far probably just cast out of local starbirth clouds' stellar interactions, but it is possible some such objects entered the Milky Way and are even now transiting. An interesting fictional take on this is in Greg Egan's new book, Perihelion Summer. In reality, some astronomers are in fact looking for such hypervelocity objects, which may evidence themselves by shock waves generated by their passage through gas clouds--none yet detected as coming from extra-galactic sources as far as I know.
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Message 1993083 - Posted: 8 May 2019, 5:32:30 UTC
Last modified: 8 May 2019, 5:36:19 UTC

As Dr. Lawn mentioned, one of the repeating FRB sources is an irregular galaxy some 2.5 billion light years away. At least some irregular galaxies are thought to be the form colliding galaxies may take, and in such cases it is possible that their cores may interact. If by chance that interaction includes increased stellar collisions with a central black hole, or multiple core black hole collisions/mergers, a large black hole (or two or more) might be set to wobbling on its spin axis even as collisional energies are added to the merging galactic cores' output. Polar particle beams typical of spinning black holes might then sweep the sky, their output by chance sweeping across us a long time later. Continuing interactions within such irregular galactic cores might quickly alter the core configurations, wrecking any alignments sweeping across us, either quickly or slowly ending any beaming of that energy toward us, hence repeater FRBs may change repeat frequency, or simply never repeat again. One of many possible scenarios.

Interestingly, as mentioned by others below, the Andromeda galaxy appears on course for a collision with the Milky Way in the distant future, and considering that both galaxies possess significant black hole(s) at their cores, our home star island might become such an object one day. If those two (or more) large core black holes collided/merged, that event would likely ignite the kind of energy output we call a "quasi-stellar radio source"--quasar. Something similar might even occur sooner for us, since the Lesser and Greater Magellanic clouds are possibly going to whirl around and be drawn into the Milky Way one day, with hopefully somewhat less dramatic effects. Yet one more good reason to keep on looking for a warp drive!
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Message 1999981 - Posted: 27 Jun 2019, 20:44:17 UTC - in response to Message 1993083.  

Scientists trace the origin of mysterious fast radio burst for the first time, revealing its home galaxy sits 3.6 BILLION light-years away
https://www.dailymail.co.uk/sciencetech/article-7189661/Scientists-trace-origin-mysterious-fast-radio-burst-time.html

Scientists have, for the first time, pinpointed the source of a mysterious one-off pulse of cosmic energy known as a fast radio burst.

Fast radio bursts (FRBs) have perplexed researchers for years, appearing as fleeting signals from the distant universe that can’t yet be explained definitively.

It’s thought that these brief flashes may come from black holes or neutron stars, though some have even speculated they may be of alien origin.
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Message 2000867 - Posted: 3 Jul 2019, 22:24:18 UTC - in response to Message 1999981.  

Another Mysterious Space Signal Was Just Traced Back to Its Source
https://www.sciencealert.com/another-mysterious-space-signal-was-just-traced-back-to-its-source

They're some of the most mysterious and powerful events in space, and we don't know what causes them – but in a major feat, astronomers have just traced another weird signal to its source.

The strange, energetic phenomena are called fast radio bursts (FRBs), and for just the second time in history – both announced in the space of a week, no less – scientists have traced a one-off FRB to the galaxy where it came from.
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Message 2006049 - Posted: 6 Aug 2019, 20:52:34 UTC - in response to Message 2000867.  

Dead planets can 'broadcast' for up to a billion years
https://phys.org/news/2019-08-dead-planets-billion-years.html

Astronomers are planning to hunt for cores of exoplanets around white dwarf stars by 'tuning in' to the radio waves that they emit.
In new research led by the University of Warwick, scientists have determined the best candidate white dwarfs to start their search, based upon their likelihood of hosting surviving planetary cores and the strength of the radio signal that we can 'tune in' to.
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Message boards : SETI Perspectives : Fast Radio Bursts: Enigmatic Signals from Across the Universe


 
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