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Do Aliens Exist?

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Poll: Does Alien Exist (282 member(s) have cast votes)

Does Alien Exist

  1. Yes (156 votes [62.15%])

    Percentage of vote: 62.15%

  2. No (27 votes [10.76%])

    Percentage of vote: 10.76%

  3. Maybe (68 votes [27.09%])

    Percentage of vote: 27.09%

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d0mm2k8
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#241

Posted 17 October 2011 - 10:33 PM

QUOTE (oysterbarron @ Monday, Oct 17 2011, 16:46)
also if astronaights are in space does that mean there actually looking into the past when looking at tue earth?

Let's not forget to factor in the extremely small amount of gravitational time dilation. On Earth, time is moving slower than up in space due the lower gravitational potential. It's much more obvious in tremendous gravitational fields such as that of a black hole. I only have a minor understanding of these concepts since I'm merely a baby physicist but it's still damn interesting and something to factor in when speaking of astronauts 'looking into the past' since we even have to factor it in when calibrating GPS.
Maybe someone else could correct me or add to what I've said?

oysterbarron
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#242

Posted 17 October 2011 - 11:35 PM

Well it explains why it takes transmissions a while to get back to earth. So a live feed from the space station would have to wait for the light to bounce off the earth and be recieved by the camera. then beamed back at light speed via a wave of some kind to mission control. So they have doubled the light recieving time but they are still looking at the earth slightly in the past!

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#243

Posted 17 October 2011 - 11:44 PM

QUOTE
Maybe someone else could correct me or add to what I've said?

You're forgetting about time dilation due to relative velocities. Because a person on the surface is at rest with respect to surface, an object on low Earth orbit is actually more time-dilated than the surface observer, while an object in a really high orbit is less time-dilated. In fact, there is an orbit at which time flows at exactly the same rate as for an observer standing on the surface. (Naturally, twin paradox is still in effect, with exactly the same resolution.)

If you assume the Earth to be perfectly spherical, id est, Schwarzschild metric, the time dilation factor due to gravity is 1/sqrt(1-2GM/rcē). I'm not sure if you can get away with it in general, but for circular orbits at least, you can simply add it to Lorentz time dilation. Fell free to plug in the numbers to find the orbit where time flows at the same rate as on the surface, from perspective of surface observer.

oysterbarron
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#244

Posted 19 October 2011 - 07:36 AM

So lightspeed does it effect human reaction times? as you would have to wait for the light to hit the retina and then the brain to render the image so you can understand it. if this is the case then were all living in the past..

K^2
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#245

Posted 19 October 2011 - 06:13 PM

Light speed delay is absolutely minimal in most situations. There is a much bigger lag while signals travel through your nervous system. It takes you about 0.15 s to respond to a visual stimulus. A big chunk of that is your "vision" lagging behind what your eyes actually receive. So yeah, your brain most certainly does live in the past, but it has little to do with speed of light.

Speed of light becomes noticeable in satellite communication. Especially, when geostationary satellites are involved. These are located 40,000km above surface, with distance between them easily as much. So there you have almost half a second of delay between you saying something, and the other person hearing it. Then just as much for the response. That creates the lag in some teleconferences. I'm sure you've noticed that before.

Things are even worse with unmanned space exploration. Distance between Earth and Mars varies between roughly 4 light minutes and 20 light minutes. So when you control a rover remotely, there can be as much as 20 minute lag between what's happening to rover on Mars and what you see here on Earth, and then 20 more minutes for your control input to be relayed back. So it can take as much as 40 minutes for reaction to something that happened. And that leads to rovers getting stuck in places, which is a big part of the reason why NASA wants better AI on these things to be able to take care of little emergencies on its own.

Edit: Woah, this is getting a bit OT.

Alastair Smyth
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#246

Posted 04 November 2011 - 03:57 AM

I find others forms of life (which we are not aware of yet/will never be) highly likeable and interesting. I think we can only begin to imagine what could be out there. Though I can only wish for who- or whatever's out there that we do not find it, since humans have this gross habit of dominating and forcing their violent ways on everybody and everything.

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#247

Posted 23 November 2011 - 12:17 AM Edited by sivispacem, 23 November 2011 - 09:05 AM.

Please do not spam in the sub-forums.

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#248

Posted 06 November 2012 - 08:15 PM Edited by sivispacem, 07 November 2012 - 07:53 AM.

Exactly aliens:NO
Life in other planets:Some of them only because of lack of oxygen and there is more heat or cold.
Life in other galaxies:YES like andromeda for example.
Life in moon:Doubtly

- Please don't bump dead topics unless you are going to contribute something significant -

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#249

Posted 10 November 2012 - 11:03 PM

QUOTE (PHCharls @ Wednesday, Oct 20 2010, 14:01)
many news keep telling about Aliens went here by UFO.IS this true or false

Whats your opinion?

Whoa... that's not the poll question! Poll question is "do they exist".

My opinion is yes; statistically I find it inconceivable that they don't.

OP then asks "have they visited us". No, I'm sure they haven't. Admiittedly I'm more sure about them existing than having failed to visit us...

tuareg
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#250

Posted 17 November 2012 - 07:25 PM Edited by tuareg, 18 November 2012 - 12:52 AM.

posting this for anyone interested!




The first few minutes of the video summarises it pretty nicely. If you really are interested you can watch it in parts. That's what i did!

feliciano2040
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#251

Posted 18 November 2012 - 06:44 PM

QUOTE (gta player13 @ Tuesday, Nov 6 2012, 20:15)
Life in other planets:Some of them only because of lack of oxygen and there is more heat or cold.

It has been theorized that some life forms may be favored by amonia (sp).

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#252

Posted 24 November 2012 - 08:39 PM Edited by sivispacem, 24 November 2012 - 11:25 PM.

I'm sure there are. BUT I don't think the "UFOs" we have "spotted" are anything alive, or even real.
So, there surely are aliens Somewhere, over the rainbow...

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THE R34P3R
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#253

Posted 14 April 2013 - 06:19 PM

I'm sure there is aswell. I doubt that we are the only ones here. But I think we also have some of it in our head, like HUGOHL said, the spots of UFOs and stuff like that isn't the real deal. But I do definitely agree that there is a form of life out there other than us.

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#254

Posted 14 April 2013 - 06:28 PM

QUOTE (THE R34P3R @ Sunday, Apr 14 2013, 19:19)
I'm sure there is aswell. I doubt that we are the only ones here. But I think we also have some of it in our head, like HUGOHL said, the spots of UFOs and stuff like that isn't the real deal. But I do definitely agree that there is a form of life out there other than us.

If your going to bump a topic in D&D, please ensure that your bump is worthwhile.
Read the sub-forum rules before posting again.




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