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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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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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How Big Would a Generation Ship Need to be to Keep a Crew of 500 Alive for the Journey ... - 4 views

www.universetoday.com/...-the-journey-to-another-star-1

space

shared by icheibas on 11 Feb 19 - No Cached

icheibas on 11 Feb 19

Interstellar space travel

<div class="cArrow"> </div><div class="cContentInner">Interstellar space travel</div>

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Fly into Solar Radiation Storm (First ACT member into space !) - 1 views

science.nasa.gov/...19apr_camilla

Solar radiation storm nasa

shared by Vincent C on 25 Apr 12 - No Cached

LeopoldS and pandomilla liked it

Vincent C on 25 Apr 12

" This isn't Camilla's first adventure. The chicken has also flown on a NASA T-38 training jet, traveled onboard a helium balloon to the stratosphere over Louisiana, visited the Yuri Gagarin Cosmonaut Training Center in Star City, Russia, and visited hundreds of elementary students in classrooms around the country. " Pretty impressive Camilla ! Congratulations :)

<div class="cArrow"> </div><div class="cContentInner">" This isn't Camilla's first adventure. The chicken has also flown on a NASA T-38 training jet, traveled onboard a helium balloon to the stratosphere over Louisiana, visited the Yuri Gagarin Cosmonaut Training Center in Star City, Russia, and visited hundreds of elementary students in classrooms around the country. " Pretty impressive Camilla ! Congratulations :)</div>

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Online Technology Forecast - 10 views

www.techcast.org/Forecasts.aspx

diigo

shared by Dario Izzo on 18 Nov 09 - Cached

Dario Izzo on 18 Nov 09

Reminds me of something .... :)

<div class="cArrow"> </div><div class="cContentInner">Reminds me of something .... :)</div>

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pacome delva on 19 Nov 09

Star travel in 2069 ! Completely crazy this guys.. and what do you do once you are around Betelgeuse or Proxima ?

<div class="cArrow"> </div><div class="cContentInner">Star travel in 2069 ! Completely crazy this guys.. and what do you do once you are around Betelgeuse or Proxima ?</div>

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Ma Ru on 19 Nov 09

Not as crazy as "one united space agency in 2020" :)

<div class="cArrow"> </div><div class="cContentInner">Not as crazy as "one united space agency in 2020" :)</div>

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Dark Matter or Black Hole Propulsion? - 1 views

How Big Would a Generation Ship Need to be to Keep a Crew of 500 Alive for the Journey ... - 4 views

Fly into Solar Radiation Storm (First ACT member into space !) - 1 views

Online Technology Forecast - 10 views

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