Author Topic: Can We Ever Colonize Space?  (Read 13422 times)

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« Reply #15 on: March 05, 2013, 06:49:10 PM »
Radar relies on bouncing radio waves off of objects. Radio waves will travel through vacuum. It's only an "echo" in the sense that a wave is bouncing back off of something.

Lasers are too narrow to be of much use, unfortunately. But they might be useful for determining the exact nature of an object after it's detected by radar.

Offline _Xenu_

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« Reply #16 on: March 05, 2013, 06:54:04 PM »
Stupid me, I thought radio waves were slower than light for some reason. Yes, use radar, but only intermittently to save energy. Still, this overall setup sounds more practical than anything else I've heard of, and might be doable within centuries.
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(No subject)
« Reply #17 on: March 05, 2013, 07:36:37 PM »
You do realize that as soon as they learn to freeze and thaw people, they'll be stacking us on airplanes like cord-wood?   :shock:

Offline Hydra009

Re:
« Reply #18 on: March 05, 2013, 07:40:22 PM »
Quote from: "Davka"
You do realize that as soon as they learn to freeze and thaw people, they'll be stacking us on airplanes like cord-wood?   :shock:
Only if they do the babies and loud talkers first.   :)

Offline _Xenu_

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« Reply #19 on: March 05, 2013, 07:49:57 PM »
Well, it beats those dinky seats...
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Offline FrankDK

Re: Can We Ever Colonize Space?
« Reply #20 on: March 05, 2013, 09:14:05 PM »
>  Theres no reason we can't colonize the galaxy at sublight speeds, it will just much, much longer.

If that were the case, assuming there are other civilizations in the galaxy, and some are billions of years older than humanity, where are they?  Why haven't they colonized the earth yet?

See Fermi Paradox.

Frank

Offline moog

Re: Can We Ever Colonize Space?
« Reply #21 on: March 05, 2013, 09:15:25 PM »
Quote from: "Davka"
Detecting large bodies in interstellar space would be a serious pain in the ass. They would be so far from any light-source that they would reflect almost no light, and block almost no light. Reflection and eclipse are the two methods we use to detect extra-Solar planets, so I'm not sure how we would be able to detect any large body in deep space. All the space sci-fi shows that depict planets and asteroids in deep space which are magically visible are completely wrong. The Enterprise would not be able to put a deep-space asteroid on-screen, because the asteroid would be as black as the rest of space.

What might work is radar, but it would require constant energy output in pinging the path ahead and reading the reflections. And it might even restrict the possible speed of the craft, since you wouldn't want to approach the speed of light, because that would render the radar useless.
....

I'm not sure this would be a big problem, space is big. Very big.
And the chances of hitting anything in interstellar space larger than an atom would be vanishingly small.

Offline _Xenu_

Re: Can We Ever Colonize Space?
« Reply #22 on: March 05, 2013, 09:26:28 PM »
Quote from: "FrankDK"
>  Theres no reason we can't colonize the galaxy at sublight speeds, it will just much, much longer.

If that were the case, assuming there are other civilizations in the galaxy, and some are billions of years older than humanity, where are they?  Why haven't they colonized the earth yet?

See Fermi Paradox.

Frank
Can't say for sure, but theres quite a few possibilities. In any case, we're talking more about how to colonize the galaxy ourselves than alien civilizations. If we ever meet any, its likely to be in the very distant future.
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Offline Hydra009

Re: Can We Ever Colonize Space?
« Reply #23 on: March 05, 2013, 10:22:28 PM »
Quote from: "FrankDK"
If that were the case, assuming there are other civilizations in the galaxy, and some are billions of years older than humanity, where are they?

There, there, there, and you can barely see it, but over there, too.  Probably.

Quote
Why haven't they colonized the earth yet?
Same reason.

Re: Can We Ever Colonize Space?
« Reply #24 on: March 06, 2013, 11:14:34 AM »
Actually, using radar at sub-luminal speeds would be perfect. You wouldn't have to be constantly pinging stuff. You would only have to do it every so often. Since basically any oving object in space is going to be moving fantastically slower than light speed, it would be VERY easy for even the technology we presently have to predict with great accuracy where the moving object will be in the future, relative to us. So, sending out radio waves (which can penetrate through pesky dust clouds) all around us might work well. Or not. ;)
Which means that to me the offer of certainty, the offer of complete security, the offer of an impermeable faith that can\'t give way, is the offer of something not worth having.
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Offline FrankDK

Re: Can We Ever Colonize Space?
« Reply #25 on: March 06, 2013, 12:26:25 PM »
> If we ever meet any, its likely to be in the very distant future.

That's the point.  This is the very distant future for many civilizations.  The universe was already 9 billion years old when the earth formed, so there must be other civilizations that have a several-billion year head start on us.  If civilizations can colonize the galaxy, then someone should have gotten here by now.

Simply moving to another location as the sun ages is a different matter.  Colonizing one planet is different from colonizing the galaxy.

Frank

Offline Plu

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« Reply #26 on: March 06, 2013, 01:08:19 PM »
Quote
If civilizations can colonize the galaxy, then someone should have gotten here by now.

Who says they can or want to colonize all of it? The place is vast beyond belief, there's no reason to think that they'd be trying to control all of it. We're just an insignificant speck of dust floating about amongst trillions of other planets. There's no reason why any race of galactic beings would be coming specifically to this little corner of the galaxy.
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Offline Thumpalumpacus

Re: Can We Ever Colonize Space?
« Reply #27 on: March 06, 2013, 01:26:28 PM »
Quote from: "Davka"
What might work is radar, but it would require constant energy output in pinging the path ahead and reading the reflections. And it might even restrict the possible speed of the craft, since you wouldn't want to approach the speed of light, because that would render the radar useless.

I would imagine that gravity sensors would be much more reliable, and perhaps be managed passively, reducing the energy demands on a ship's propulsion.
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Re: Can We Ever Colonize Space?
« Reply #28 on: March 06, 2013, 04:57:07 PM »
You'd be mistaken to think that we wont colonize space. The human race has adapted to every situation that has arisen and it will continue to do so.

It is also imperative that we colonize space if we are to thrive as a species in the long term.
"I\'m not a schemer. I just try to show the schemers how pathetic their attempts to control things really are."

Offline Nonsensei

Re: Can We Ever Colonize Space?
« Reply #29 on: March 06, 2013, 05:23:45 PM »
Quote from: "VaasMontenegro"
You'd be mistaken to think that we wont colonize space. The human race has adapted to every situation that has arisen and it will continue to do so.

It is also imperative that we colonize space if we are to thrive as a species in the long term.


Technically it isn't though. We have two avenues: Expand into space or learn how to manage our existence on this planet. Frankly the latter is the harder one but if we can manage it we have quite a while until the sun burns out and perhaps by then we will have somehow found a solution to that problem as well.

To me expanding into space isnt about that we HAVE to its that theres no reason not to.
And on the wings of a dream so far beyond reality
All alone in desperation now the time has come
Lost inside you\'ll never find, lost within my own mind
Day after day this misery must go on

 

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