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Originally posted by georgejetson
reply to post by VonDoomen
How does squeezing/compressing dark matter annihilate it?
According to some theories on dark matter, one of the ways it is different from regular matter is that its particles and antiparticles are exactly the same. I think this is to explain why it doesn't interact with regular matter except through gravity.
Anyway, assuming dark matter particles are their own antiparticles, when they collide under the right circumstances, they annihilate each other. The interstellar medium is really spread out, and particles in it hardly ever collide, but if you vacuum it up and squeeze it into a box, the collisions will become more and more regular, until it goes kaboom.
[edit on 26-11-2009 by georgejetson]
Originally posted by VonDoomen
Okay, I can see how this a theory, but Im having trouble understanding
"one of the ways it is different from regular matter is that its particles and antiparticles are exactly the same. I think this is to explain why it doesn't interact with regular matter except through gravity."
if the particles are "the same" how can they act differently.
Also, with dark matter composing 90-95% of the universe, its collision would be much more often. And on top of that, matter/anti-matter collisions produce the most energy, complete conversion of matter into energy.
ALSO, DO NOT CONFUSE ANTI-MATTER WITH DARK MATTER.
They are 2 completely different concepts. We actualy have and can produce Anti-matter in minute quantities. Dark matter we have no freakin clue.
Originally posted by Outrageo
Ok - so who wants to go for a ride?
Originally posted by Silicis n Volvo
this solves nothing...id be surprised if the cleverest minds on earth really did think of this because it shows a complete lack of thought.
just our galaxy alone is millions of light years across...we can not see our entire galaxy but from what we on earth can see with our most advanced technology is stars that are thousands of light years away
if this black hole/dark matter idea were used your say it would get us to near the speed of light?? so it would still take thousands of years to get even a tiny distance from our own planet (when compared to the size of the universe) stars that are 10,000 light years away are still only in our own back yard when compared to the universe. we may be able to get to stars that are a few light years away with this idea but we have already studied nearby stars and havnt found any ET life around them. so this would be evidence to disprove aliens using this method. unless someone proves einsteins theory of relativity wrong by traveling faster than light or teleportation is advanced enough to work inter-planetary or even a method for bending space is invented then a simple spaceship traveling at the speed of light is not good enough to traverse the galaxy let alone the unvierse.
silly thread imo
ABSTRACT: We investigate whether it is physically possible to build starships or power plants using the Hawking radiation of an artificial black hole as a power source. The proposal seems to be at the edge of possibility, but quantum gravity effects could change the picture.
We can either speculate on what humanity might achieve in the distant future or we can speculate on what a hypothetical extraterrestrial civilization might have already done. The first line of thought postpones the possibility of any tangible results indefinitely into the future. On the other hand, the second line of thought raises a legitimate scientific question that could be settled by contemporary or near-term astronomical observations. We can ask ourselves what an extraterrestrial BH starship or other high technology would look like from Earth and proceed to look for it, if possible.
Originally posted by sapien82
if dark matter only reacts with matter through gravity then how do we know that dark matter isnt really just gravity ! How can we tell the difference between the two ?
He asked them questions about their technology and life in general, and they told him that they use what they call 'The Void' (nothingness) as a source of infinite energy for all their technology and interstellar/dimensional travel
The book spans a wide variety of topics within each part. The interstellar travel part hits upon the vastness of space, chemical and fusion rockets, slow moving generational space arks, space curvature, non-space (i.e., hyperspace), wormholes, blackholes, time dilatation, and tachyons. The author concludes this part with an incredibly enjoyable discussion of problems one might face while attempting to navigate while traveling at near light speed. The extraterrestrial life part touches upon the chemistry of aliens, estimating the number of possible extraterrestrial civilizations (i.e., the Drake function), possible extraterrestrial contact in ancient history, and a discussion about possible contact in recent history.
Yes! UFOs are mentioned in this book, but don't roll your eyes because the author does not get fanatical about the topic. He is mainly presenting UFOs in the context that some extraterrestrial civilization might have perfected interstellar travel in our past (i.e., ancient astronauts) or maybe even our present. I thought it was a good tie-in independent of ones views on the topic of UFOs.
Originally posted by TrueBrit
I have a question. This black hole drive right ? If I read this thread correctly , folks think this could be built now ? I personaly find this hard to believe since we are on a planet where we still burn fossil fuel to move around.