Group items tagged cosmic - Advanced Concepts Team

Cosmic Log - Volunteers find another prize pulsar - 2 views

cosmiclog.msnbc.msn.com/...eers-find-another-prize-pulsar

phy pulsar @home

shared by Joris _ on 02 Mar 11 - No Cached

LeopoldS liked it

Joris _ on 02 Mar 11

http://einstein.phys.uwm.edu/

<div class="cArrow"> </div><div class="cContentInner"><a href="http://einstein.phys.uwm.edu/" rel="nofollow" target="_blank">http://einstein.phys.uwm.edu/</a></div>

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LeopoldS on 05 Mar 11

like the profiles ... "The clearest evidence for the pulsar's existence was provided by computers operated by two volunteers: Vitaly Shiryaev, a Russian researcher who has a Ph.D. in radio physics; and Stacey Eastham, who does vehicle testing for the British government in Darwen. In his profile, Eastham says he's studying astronomy and physics on the side. He got involved in the Einstein @ Home project because he's interested in "anything space-like, and being able to be part of something like this is right up my street."

<div class="cArrow"> </div><div class="cContentInner">like the profiles ... "The clearest evidence for the pulsar's existence was provided by computers operated by two volunteers: Vitaly Shiryaev, a Russian researcher who has a Ph.D. in radio physics; and Stacey Eastham, who does vehicle testing for the British government in Darwen. In his profile, Eastham says he's studying astronomy and physics on the side. He got involved in the Einstein @ Home project because he's interested in "anything space-like, and being able to be part of something like this is right up my street."</div>

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BBC News - Speed-of-light experiments give baffling result at Cern - 5 views

www.bbc.co.uk/...science-environment-15017484

PHY physics Einstein

shared by LeopoldS on 22 Sep 11 - No Cached

LeopoldS on 22 Sep 11

Sante, Luzi have a look at this???!!!

<div class="cArrow"> </div><div class="cContentInner">Sante, Luzi have a look at this???!!!</div>

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...3 more comments...
Luís F. Simões on 23 Sep 11

and here's the xkcd on it: http://xkcd.com/955/

<div class="cArrow"> </div><div class="cContentInner">and here's the xkcd on it: <a href="http://xkcd.com/955/" rel="nofollow" target="_blank">http://xkcd.com/955/</a></div>

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Luzi Bergamin on 23 Sep 11

And here's the arXiv paper http://arxiv.org/abs/1109.4897 Serious? Difficult to say. I'm theorist and can't really rate their measurement techniques. Certainly be cautious, mostly such things disappear faster than they appeared.

<div class="cArrow"> </div><div class="cContentInner">And here's the arXiv paper <a href="http://arxiv.org/abs/1109.4897" rel="nofollow" target="_blank">http://arxiv.org/abs/1109.4897</a> Serious? Difficult to say. I'm theorist and can't really rate their measurement techniques. Certainly be cautious, mostly such things disappear faster than they appeared.</div>

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LeopoldS on 23 Sep 11

it took them 3 years to "appear"!

<div class="cArrow"> </div><div class="cContentInner">it took them 3 years to "appear"!</div>

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Luzi Bergamin on 23 Sep 11

Leo, you mean that they measured 3 years? That's not a point to criticize: since the only interaction of neutrinos with matter is the Weak Interaction (which is indeed very, very weak), it is extremely hard to get a reasonable statistic. By the same reason, it's essentially impossible to shield the experiment from the background. And this background (solar neutrinos, cosmic radiation neutrinos) is huge.

<div class="cArrow"> </div><div class="cContentInner">Leo, you mean that they measured 3 years? That's not a point to criticize: since the only interaction of neutrinos with matter is the Weak Interaction (which is indeed very, very weak), it is extremely hard to get a reasonable statistic. By the same reason, it's essentially impossible to shield the experiment from the background. And this background (solar neutrinos, cosmic radiation neutrinos) is huge.</div>

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pacome delva on 28 Sep 11

for sure a result to be taken seriously. It makes a buzz in my lab... but always be cautious with this kind of declaration, that hugely violates all physics we know and even most of the reasonable alternative theories... Remember the Pionneer anomaly for which it took almost ten years to set up that finally its a thermal effect.

<div class="cArrow"> </div><div class="cContentInner">for sure a result to be taken seriously. It makes a buzz in my lab... but always be cautious with this kind of declaration, that hugely violates all physics we know and even most of the reasonable alternative theories... Remember the Pionneer anomaly for which it took almost ten years to set up that finally its a thermal effect.</div>

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Probing the cosmic-ray-climate link - physicsworld.com - 0 views

physicsworld.com/...46953

climate PHY science

shared by santecarloni on 26 Aug 11 - No Cached

A new equation for life - Cosmic Log - msnbc.com - 0 views

cosmiclog.msnbc.msn.com/...2072217.aspx

exoplanets habitability

shared by Nina Nadine Ridder on 17 Sep 09 - Cached

Six mind-blowing ideas - Cosmic Log - msnbc.com - 0 views

cosmiclog.msnbc.msn.com/...1881705.aspx

shared by Nina Nadine Ridder on 17 Jun 09 - Cached

How much is that in Apollos? - Cosmic Log - msnbc.com - 0 views

cosmiclog.msnbc.msn.com/...1489144.aspx

politics SPS

shared by ESA ACT on 24 Apr 09 - Cached

ESA ACT on 24 Apr 09

put in perspective .... we could also have a large scale SPS for this ...

<div class="cArrow"> </div><div class="cContentInner">put in perspective .... we could also have a large scale SPS for this ...</div>

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A Cosmic Question: How to Get Rid Of All That Orbiting Space Junk? - WSJ.com - 0 views

online.wsj.com/...lMyQjAxMDI5MzE2MTcxMjE4Wj.html

debris

shared by ESA ACT on 24 Apr 09 - Cached

ESA ACT on 24 Apr 09

nice article on space debris

<div class="cArrow"> </div><div class="cContentInner">nice article on space debris</div>

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Rocketeers take lead in $1 million race - Cosmic Log - msnbc.com - 1 views

cosmiclog.msnbc.msn.com/...2111070.aspx

prizes lunar lander technology

shared by Juxi Leitner on 02 Nov 09 - Cached

The judges will weigh all this over the next few days, in advance of an awards ceremony scheduled Thursday in Washington.
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Dark Matter or Black Hole Propulsion? - 1 views

www.newscientist.com/...s-for-interstellar-travel.html

NRG propulsion star travel space PHY

shared by Ma Ru on 25 Nov 09 - Cached

Ma Ru on 25 Nov 09

Anyone out there still doing propulsion stuff? Two more papers just waiting to get busted... http://arxiv.org/abs/0908.1429v1 http://arxiv.org/abs/0908.1803

<div class="cArrow"> </div><div class="cContentInner">Anyone out there still doing propulsion stuff? Two more papers just waiting to get busted... <a href="http://arxiv.org/abs/0908.1429v1" rel="nofollow" target="_blank">http://arxiv.org/abs/0908.1429v1</a> <a href="http://arxiv.org/abs/0908.1803" rel="nofollow" target="_blank">http://arxiv.org/abs/0908.1803</a></div>

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...5 more comments...
Luzi Bergamin on 26 Nov 09

What an awful bunch of complete nonsense!!! But I don't think anybody wants to hear MY opinion on this...

<div class="cArrow"> </div><div class="cContentInner">What an awful bunch of complete nonsense!!! But I don't think anybody wants to hear MY opinion on this...</div>

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pacome delva on 26 Nov 09

wow, is this serious at all...!?

<div class="cArrow"> </div><div class="cContentInner">wow, is this serious at all...!?</div>

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Luzi Bergamin on 26 Nov 09

Are you joking?? The BH drive propses a BH with a lifetime of about an year, just 10^7 tons, peanuts!! Then you have to produce it, better not on Earth, so you do this in space, with a laser that produces an equivalent of 10^9 tons highly foucussed, even more peanuts!! Reasonable losses in the production process (probably 99,999%) are not yet taken into account. Engineering problems... :-) The DM drive is even better, they want to collect DM and compress it in a propulsion chamber. Very easy to collect and compress a gas of particles that traverse the Earth without any interaction. Perhaps if the walls of the chamber are made of artificial BHs?? Who knows??

<div class="cArrow"> </div><div class="cContentInner">Are you joking?? The BH drive propses a BH with a lifetime of about an year, just 10^7 tons, peanuts!! Then you have to produce it, better not on Earth, so you do this in space, with a laser that produces an equivalent of 10^9 tons highly foucussed, even more peanuts!! Reasonable losses in the production process (probably 99,999%) are not yet taken into account. Engineering problems... :-) The DM drive is even better, they want to collect DM and compress it in a propulsion chamber. Very easy to collect and compress a gas of particles that traverse the Earth without any interaction. Perhaps if the walls of the chamber are made of artificial BHs?? Who knows??</div>

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LeopoldS on 26 Nov 09

WRONG!!! we are all just WAITING for your opinion on this ....!!!

<div class="cArrow"> </div><div class="cContentInner">WRONG!!! we are all just WAITING for your opinion on this ....!!!</div>

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pacome delva on 27 Nov 09

well, yes my remark was ironic... I'm surprised they did a magazine on these concepts...! But the press is always waiting for sensational. They do not even wait for the work to be peer-reviewed now to make an article on it ! This is one of the bad sides of arxiv in my opinion. It's like a journalist that make an article with a copy-paste in wikipedia ! Anyway, this is of course complete bullsh..., and I would have laughed if I had read this in a sci-fi book... but in a "serious" article i'm crying... For the DM i do not agree with your remark Luzi. It's not dark energy they want to use. The DM is baryonic, it's dark just because it's cold so we don't see it by usual means. If you believe the in the standard model of cosmology, then the DM should be somewhere around the galaxies. But it's of course not uniformly distributed, so a DM engine would work (if at all...) only in the periphery of galaxies. It's already impossible to get there...

<div class="cArrow"> </div><div class="cContentInner">well, yes my remark was ironic... I'm surprised they did a magazine on these concepts...! But the press is always waiting for sensational. They do not even wait for the work to be peer-reviewed now to make an article on it ! This is one of the bad sides of arxiv in my opinion. It's like a journalist that make an article with a copy-paste in wikipedia ! Anyway, this is of course complete bullsh..., and I would have laughed if I had read this in a sci-fi book... but in a "serious" article i'm crying... For the DM i do not agree with your remark Luzi. It's not dark energy they want to use. The DM is baryonic, it's dark just because it's cold so we don't see it by usual means. If you believe the in the standard model of cosmology, then the DM should be somewhere around the galaxies. But it's of course not uniformly distributed, so a DM engine would work (if at all...) only in the periphery of galaxies. It's already impossible to get there...</div>

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Luzi Bergamin on 27 Nov 09

One reply to Pacome, though the discussion exceeds by far the relevance of the topic already. Baryonic DM is strictly limited by cosomology, if one believes in these models, of course. Anyway, even though most DM is cold, we are constantly bombarded by some DM particles that come together with cosmic radiation, solar wind etc. etc. If DM easily interacted with normal matter, we would have found it long ago. In the paper they consider DM as neutralinos, which are neither baryonic nor strongly or electromagnetically interacting.

<div class="cArrow"> </div><div class="cContentInner">One reply to Pacome, though the discussion exceeds by far the relevance of the topic already. Baryonic DM is strictly limited by cosomology, if one believes in these models, of course. Anyway, even though most DM is cold, we are constantly bombarded by some DM particles that come together with cosmic radiation, solar wind etc. etc. If DM easily interacted with normal matter, we would have found it long ago. In the paper they consider DM as neutralinos, which are neither baryonic nor strongly or electromagnetically interacting.</div>

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pacome delva on 27 Nov 09

well then I agree, how the fu.. they want to collect them !!!

<div class="cArrow"> </div><div class="cContentInner">well then I agree, how the fu.. they want to collect them !!!</div>

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Astronomers Surprised to Find Asteroid With Rings - 2 views

www.wired.com/...asteroid-ring-system

space

shared by johannessimon81 on 27 Mar 14 - No Cached

Athanasia Nikolaou liked it

johannessimon81 on 27 Mar 14

For the first time ever, astronomers have discovered a ring system surrounding an asteroid. The finding is a complete surprise to planetary scientists, who are yet unsure exactly how such rings could have formed. The cosmic bling was found around an object named Chariklo, which orbits in a region between Saturn and Uranus.

<div class="cArrow"> </div><div class="cContentInner">For the first time ever, astronomers have discovered a ring system surrounding an asteroid. The finding is a complete surprise to planetary scientists, who are yet unsure exactly how such rings could have formed. The cosmic bling was found around an object named Chariklo, which orbits in a region between Saturn and Uranus.</div>

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Black-hole mergers cast kaleidoscope of shadows - 6 views

www.nature.com/...aleidoscope-of-shadows-1.16283

science PHY space FUN

shared by annaheffernan on 12 Nov 14 - No Cached

Thijs Versloot, Beniamino Abis, and Christophe Praz liked it

annaheffernan on 12 Nov 14

In Interstellar, the science-fiction film out this week, Matthew McConaughey stars as an astronaut contending with a supermassive black hole called Gargantua. The film's special effects have been hailed as the most realistic depiction ever made of this type of cosmic object. But astrophysicists have now gone one better - this is a really cool visualisation done by researchers in Cornell.

<div class="cArrow"> </div><div class="cContentInner">In Interstellar, the science-fiction film out this week, Matthew McConaughey stars as an astronaut contending with a supermassive black hole called Gargantua. The film's special effects have been hailed as the most realistic depiction ever made of this type of cosmic object. But astrophysicists have now gone one better - this is a really cool visualisation done by researchers in Cornell.</div>

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Thijs Versloot on 12 Nov 14

Wow, impressive! Simulating eXtreme Spacetimes (SXS) software, very quick merging process though 17ms.. Observable?

<div class="cArrow"> </div><div class="cContentInner">Wow, impressive! Simulating eXtreme Spacetimes (SXS) software, very quick merging process though 17ms.. Observable?</div>

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Beniamino Abis on 13 Nov 14

Mind-blowing!

<div class="cArrow"> </div><div class="cContentInner">Mind-blowing!</div>

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A Radically Conservative Solution for Cosmology's Biggest Mystery - 2 views

www.quantamagazine.org/logys-biggest-mystery-20180501

PHY space Cosmology

shared by jaihobah on 02 May 18 - No Cached

jaihobah on 02 May 18

Two ways of measuring the universe's expansion rate yield two conflicting answers. Many point to the possibility of new physics at work, but a new analysis argues that unseen errors could be to blame. See also this work based on GAIA data that, on the other hand, reinforces the discrepancy: Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant https://arxiv.org/abs/1804.10655

<div class="cArrow"> </div><div class="cContentInner">Two ways of measuring the universe's expansion rate yield two conflicting answers. Many point to the possibility of new physics at work, but a new analysis argues that unseen errors could be to blame. See also this work based on GAIA data that, on the other hand, reinforces the discrepancy: Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant <a href="https://arxiv.org/abs/1804.10655" rel="nofollow" target="_blank">https://arxiv.org/abs/1804.10655</a></div>

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To Sleep, Perchance to Clean - University of Rochester Medical Center - 2 views

www.urmc.rochester.edu/...-sleep-perchance-to-clean.aspx

BIO

shared by gpetit on 04 Jul 17 - No Cached