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post #6211 of 6222 Old 05-07-2014, 05:11 PM
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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 6222 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 6222 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 6222 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 6222 Old 05-07-2014, 08:36 PM
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Originally Posted by archiguy View Post

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 6222 Old 05-07-2014, 11:10 PM
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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 6222 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 6222 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 6222 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 6222 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 6222 Old 05-11-2014, 07:37 PM
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Thanx, ADU.
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Here is some Hubble Extreme Deep Field goodness:



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post #6222 of 6222 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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