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post #6211 of 6237 Old 05-07-2014, 05:11 PM
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Originally Posted by archiguy View Post

So, theoretically, you'd be able to determine where the concentrations of dark matter are by sensing their gravitational fields? Still, how would you be sure you were not just flying close to some dark matter body, but on a collision course with it? And I'm presuming it would react the same way normal matter would if you zoomed into it at great speed -- splat!
Hmmm, well, you'd have to determine its location by some means other than light...
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post #6212 of 6237 Old 05-07-2014, 05:55 PM
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Hmmm, well, you'd have to determine its location by some means other than light...
Or the spectrum of light we can see. Isn't that how we determined it's even there, by using light on either side of the humanly visible spectrum, like infrared, ultraviolet, etc?
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post #6213 of 6237 Old 05-07-2014, 07:52 PM
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Or the spectrum of light we can see. Isn't that how we determined it's even there, by using light on either side of the humanly visible spectrum, like infrared, ultraviolet, etc?
I thought its presence was determined by its gravitational effects.
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post #6214 of 6237 Old 05-07-2014, 07:56 PM
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^ What he said. If it exists, then per this article, it's essentially transparent to all light and electromagnetic radiation.

 

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Dark matter's existence is inferred from gravitational effects on visible matter and gravitational lensing of background radiation, and was originally hypothesized to account for discrepancies between calculations of the mass of galaxies, clusters of galaxies and the entire universe made through dynamical and general relativistic means, and calculations based on the mass of the visible "luminous" matter these objects contain: stars and the gas and dust of the interstellar and intergalactic medium.[1]

 

It doesn't sound like it generally reacts with normal (baryonic) matter either (at least not on the sort of scales some of you are talking about), so you probably wouldn't have to worry about "running into it".


A prominent theory is that dark matter is composed of WIMPs. :)


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post #6215 of 6237 Old 05-07-2014, 08:36 PM
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Pretty cool. I've wondered about something... Does dark matter make space travel hazardous? I mean, is there a possibility that you're cruising along in what you perceive as empty space, got some vast magnetic field projected around the spaceship to ward off dust particles and other small debris (you navigate around larger stuff), and then you run smack-dab into some dark matter thingamajig that you never saw? Get your astro-ass pancaked. Could that happen?

You're taking it's title as literal. It isn't so much that it is 'dark' matter as in, we can't see it. It's not a solid object that we would collide with. Instead it's really just a force that we don't quite understand yet. Dark Matter, as it's named currently, is simply just something we don't fully understand so we just call it, 'dark matter'.

It is even likely that this matter is all around us now and we don't even know it.

Interesting stuff, for sure.

On a related note. Yes, space is very dangerous and there are many, many other factors that would make interplanetary space travel quite hazardous. Honestly, dark matter is probably the least of your worries out there. wink.gif

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post #6216 of 6237 Old 05-07-2014, 11:10 PM
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Quote:
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Or, it's something I found in a burrito the other day. eek.giftongue.gif
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Quote:
Originally Posted by archiguy View Post

So, theoretically, you'd be able to determine where the concentrations of dark matter are by sensing their gravitational fields? Still, how would you be sure you were not just flying close to some dark matter body, but on a collision course with it? And I'm presuming it would react the same way nor mal matter would if you zoomed into it at great speed -- splat!
In order to perceive the mysteries of dark matter, it requires a high IQ.
Sorry...someone had to say it.tongue.gif

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post #6217 of 6237 Old 05-11-2014, 06:29 PM
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First HD view of an earthrise over the moon, taken by Japan's Kaguya spacecraft on November 7th, 2007.

 


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post #6218 of 6237 Old 05-11-2014, 06:34 PM
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Another earthrise taken while orbiting along the moon's terminator (the division between night and day) on December 31, 2007.

 


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post #6219 of 6237 Old 05-11-2014, 06:39 PM
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One more with earth fully illuminated from April 5th, 2008.

 


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post #6220 of 6237 Old 05-11-2014, 07:01 PM
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High-resolution computer simulation (with original audio) of the first lunar earthrise taken by Apollo 8 astronauts on December 24, 1968.

 


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post #6221 of 6237 Old 05-11-2014, 07:37 PM
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Thanx, ADU.
cool.gif

Here is some Hubble Extreme Deep Field goodness:



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post #6222 of 6237 Old 05-11-2014, 08:10 PM
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^ Nice!

 

I feel like this should be playin behind some of those earthrise videos. :)

 

 

That's another film though.


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post #6223 of 6237 Old 04-14-2015, 01:27 PM
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Hey Folks! Its been a while. Just wanted to post a link to some pretty interesting commentary going on here; http://www.cnn.com/2015/04/13/opinio...ife/index.html . The article discusses the possibility of 40 billion earth like planets in the Milky way and the ensuing commentary debates the chances of ever making contact with any life forms. Below is an example of the current comments.






What makes space travel nearly impossible is that our human bodies could never survive. Our own physical relationship with time (how long it takes everything to revolve around everything else here in our own solar system) is like our universal signature and very much inescapable. If we were to travel beyond our solar system, beyond our galaxy... the rhythm of our beating hearts alone, not to mention our sleeping patterns, would be a dead giveaway as to our exact location of origin in the universe... For any advanced society who has accurately mapped out the universe, this wouldn't be all that difficult.


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@Carter DeSoto The Newtonian 3D perspective on time and space makes it seem impossible, but not according to the higher dimensional models of space-time that we have today.



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@Rudy _NYC @Carter DeSoto

We live and operate in a 3D + time universe. Tell me, on earth, where is the species that can percieve more than 3D. Show me in the known universe some body that is moving in and out of our 3D universe, disappearing and reappearing somewhere else? In theory it may exist, but in reality we cannot interact with it, like moving in time a wonderful thought, but an impossible reality.







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@Carter DeSoto

You are wrong. A generation ship traveling 1/2 the speed of light would reach Alpha Centuria in approximately 8 - 10 years (ship time) for a round trip of 30 years; leaving 5 years or so for exploration. Totally doable from the human standpoint, if we had the technology to build the ship. We send 20 somethings and they come back 50 somethings (with kids).




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@vg19 59 I believe that CarterDeSoto said "nearly impossible."


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@vg19 59 @Carter DeSoto and it only takes 1 year of acceleration at roughly 1g to reach nearly the speed of light (close enough for relativistic effects to become noticeable)


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@bobt hemoose @vg19 59 @Carter DeSoto

Assuming you can boost infinite mass. I think 1/2 light is an obtainable goal, not Star Trek, but allows us to explore our near neighbors.




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@vg19 59 @bobt hemoose @Carter DeSoto mass increase at .5c is only about 10% and at .8c it's only 50%. we can get a majority of the way to c before relativistic effects are an issue.






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@bobt hemoose @vg19 59 @Carter DeSoto Where is the energy required for the four large delta-Vs coming from? And how do you shield the crew from radiation during the voyage?


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@poopsie 7 @bobt hemoose @vg19 59 @Carter DeSoto

This all engineering, daunting today, but not tommorrow.

Look at our areo-space industry, 75 years ago nobody believed a rocket could fly, although Goddard, & Von-Braun knew that it was just engineering. Same here, if we want it bad enough we will develop engines, fuels, environments to do it.




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@bobt hemoose @vg19 59 @Carter DeSoto

I glad you know the math. But, even at .90c we are still just bumping around the universe. I thinking about 100 ly max. What it does mean that we could have scattered colonies on multiple planets, started by individual ships; they just wouldn't be in contact with each other. No Federation of Planets, no Cylon hordes (I hope).




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How about talk to them now. Witnessing a ufo hovering 50 ft above makes you realize all we

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post #6224 of 6237 Old 04-15-2015, 11:08 AM
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Quote:
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Hey Folks! Its been a while. Just wanted to post a link to some pretty interesting commentary going on here;
Quote:
@bobthemoose @vg1959 @CarterDeSoto Where is the energy required for the four large delta-Vs coming from? And how do you shield the crew from radiation during the voyage?
For an interesting and entertaining SF read on this subject I highly recommend "Tau Zero" by Poul Anderson. He postulates the use of a "Bussard Ramjet" which uses magnetic fields to scoop hydrogen from the interstellar medium through which the ship is travelling. This serves both as a radiation shield and as a source of fuel. The ship accelerates close to the speed of light where the time dilation factor ("Tau") approaches zero.
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post #6225 of 6237 Old 04-15-2015, 11:27 AM
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I watched original as a kid. Always loved it. I watched it recently and I'm still impressed by it. The video was very good, sound was good and of course the story is great.
 
I love the original also......... The 2002 version is nice as well........ Its good they didnt try to copy the original THAT MUCH or it wouldnt have been as good......
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post #6226 of 6237 Old 04-21-2015, 05:11 PM
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As a nearly 40 year old I don't watch many movies older than late 70's, but I've always loved the original Time Machine. The remake was just awful. But the original will always have a dedicated spot in my memory banks.

I caved!
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post #6227 of 6237 Old Yesterday, 12:39 AM
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Ya I do prefer the ORIGINAL in just about EVERYTHING as I value the purity our world once had.......
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post #6228 of 6237 Old Yesterday, 05:15 AM
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I value the purity our world once had.......
What "world" was that??
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post #6229 of 6237 Old Yesterday, 07:03 AM
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Ya I do prefer the ORIGINAL in just about EVERYTHING as I value the purity our world once had.......
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What "world" was that??
I'm guessing pre-Cambrian.
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post #6230 of 6237 Old Yesterday, 07:51 AM
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I'm guessing pre-Cambrian.
LOL!

...There are two things that I like in the 2002 film (if this thread is actually about the films ): that it was directed by HG Wells' great grandson, Simon Wells (which didn't go especially well for him as Gore Verbinski completed the shooting), the film was his first live-action film as a director. And I like the desperate, yet futile, quest of the main character to save his loved one. The film could have been much better I guess, but that's certainly no the worst I've seen. Pal's version is a classic, and a favorite of mine, it's the first science-fiction film I saw as a kid, and I became a fan of the genre because of it.

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post #6231 of 6237 Old Yesterday, 12:35 PM
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I'm guessing pre-Cambrian.
Must be...

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post #6232 of 6237 Old Yesterday, 01:21 PM
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I have my DVR set for NOVA tonight on PBS. 25 years of the Hubble telescope in 25 stunning photos
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post #6233 of 6237 Old Yesterday, 06:17 PM
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I have my DVR set for NOVA tonight on PBS. 25 years of the Hubble telescope in 25 stunning photos
The greatest scientific instrument ever built (I'm recording too).

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post #6234 of 6237 Old Yesterday, 09:44 PM
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Congrats to Tack for being the first person to give this venerable old thread from the AVS Devonian era a "like".



I liked (and would recommend) both versions of the film btw. RIP Rod Taylor.

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post #6235 of 6237 Old Yesterday, 11:17 PM
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RIP Rod Taylor.
Amen to that, sir.
I will never forget him in The Birds.

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post #6236 of 6237 Old Today, 05:16 AM
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The Time Machine thread: May it live long and prosper.

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post #6237 of 6237 Old Today, 08:39 AM
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^Awesome, Rich (shedding one more tear for LN).

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