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scottk
sage


Reged: 08/29/09

Loc: Tennessee
If aliens had a telescope so powerful....
      #5912857 - 06/10/13 11:36 AM

that they could see a dime on a sidewalk on Earth from another galaxy, would it be a reflector or a refractor?

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Ravenous
sage


Reged: 11/14/09

Loc: UK
Re: If aliens had a telescope so powerful.... new [Re: scottk]
      #5912869 - 06/10/13 11:41 AM

Let's just say that its aperture would be so big, we could see it ourselves from here. (Well, almost.)

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Qwickdraw
Carpal Tunnel
*****

Reged: 03/03/12

Loc: Ann Arbor, MI
Re: If aliens had a telescope so powerful.... new [Re: Ravenous]
      #5912874 - 06/10/13 11:44 AM

At that magnification it would be some type of quantum view scope or something we have not even imagined yet.

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Rudra
super member


Reged: 07/02/10

Re: If aliens had a telescope so powerful.... new [Re: Qwickdraw]
      #5913010 - 06/10/13 12:45 PM

So assuming that making such a telescope is possible and that they have it and they are looking through it, as I am typing this message. Would they be seeing me typing this post on the www.cloudynights.com? No. If they are located within 200 light years from our location, they might be seeing the Earth as it was in 1813. They would still be seeing us using horse drawn carriages, with little railway transportation, pristine locals with little or no pollution and of course pitch dark skies

If the civilization having such a telescope was located about 2000+ light years away, then perhaps they will see pyramids of Egypt being built. In Greece, they would have seen Socrates, Plato, Aristotal etc indulging in academic discussions on philosophy, maths and astronomy and perhaps smiling that we consider Earth as the center of the Universe.

Edited by Rudra (06/10/13 12:50 PM)


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llanitedave
Humble Megalomaniac
*****

Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: If aliens had a telescope so powerful.... new [Re: Rudra]
      #5913028 - 06/10/13 12:52 PM

It would be an orbital interferometer in a wide orbit around their star. Getting telescope time would probably require a major grant, and oodles of red tape.

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shawnhar
Postmaster
*****

Reged: 06/25/10

Loc: Knoxville, TN
Re: If aliens had a telescope so powerful.... new [Re: Rudra]
      #5913042 - 06/10/13 01:02 PM

Perhaps a generated black hole at a certain distance, with another one used as a corrective lens. Don't think a refractor's gonna cut it.

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deSitter
Still in Old School


Reged: 12/09/04

Re: If aliens had a telescope so powerful.... new [Re: shawnhar]
      #5913086 - 06/10/13 01:28 PM

In principle a large enough optical scope would reveal distant details as small as you like. Pointing it would be an interesting problem in relativistic rigid body concepts. And it would have some gnarly coma.

-drl


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scottk
sage


Reged: 08/29/09

Loc: Tennessee
Re: If aliens had a telescope so powerful.... new [Re: deSitter]
      #5913095 - 06/10/13 01:32 PM

I suppose it would have its own gravity with things orbiting it. Which could cause a problem with meteors and all.

Edited by scottk (06/10/13 01:37 PM)


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Rick Woods
Postmaster
*****

Reged: 01/27/05

Loc: Inner Solar System
Re: If aliens had a telescope so powerful.... new [Re: shawnhar]
      #5913410 - 06/10/13 03:46 PM

Quote:

Perhaps a generated black hole at a certain distance, with another one used as a corrective lens.




That's what I was going to say, a gravitational lens telescope of some kind.


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scopethis
Postmaster
*****

Reged: 05/30/08

Loc: Kingman, Ks
Re: If aliens had a telescope so powerful.... new [Re: scottk]
      #5913421 - 06/10/13 03:49 PM

and by mistake, someone pointed it at their "Sun" and light from the eyepiece toasted their planet..

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Qwickdraw
Carpal Tunnel
*****

Reged: 03/03/12

Loc: Ann Arbor, MI
Re: If aliens had a telescope so powerful.... new [Re: scopethis]
      #5913584 - 06/10/13 04:57 PM

Quote:

and by mistake, someone pointed it at their "Sun" and light from the eyepiece toasted their planet..




HAHAHA I was just going to say that and got to your post.


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Pess
(Title)
*****

Reged: 09/12/07

Loc: Toledo, Ohio
Re: If aliens had a telescope so powerful.... new [Re: Rick Woods]
      #5913607 - 06/10/13 05:14 PM

Quote:

Quote:

Perhaps a generated black hole at a certain distance, with another one used as a corrective lens.




That's what I was going to say, a gravitational lens telescope of some kind.




That would work.

They could swing around in a ship and look in different directions and come back & forward to focus.

Of course, if that had that space potential, why not just fly the ship to whatever they wanted to look at?

But if they lacked long distance space flight capability BUT had the ability to generate locally intense gravitational fields......

Pesse (ACME portable gravitational field generator..caution: do not operate near planets!) Mist


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Mister T
Pooh-Bah


Reged: 02/01/08

Loc: Upstate NY
Re: If aliens had a telescope so powerful.... new [Re: Pess]
      #5913620 - 06/10/13 05:25 PM

And would it have the magnification printed on the box??

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llanitedave
Humble Megalomaniac
*****

Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: If aliens had a telescope so powerful.... new [Re: Mister T]
      #5913640 - 06/10/13 05:34 PM

$49.95

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scottk
sage


Reged: 08/29/09

Loc: Tennessee
Re: If aliens had a telescope so powerful.... new [Re: Mister T]
      #5913679 - 06/10/13 05:56 PM

Yes. It could be pushed all the way to like 700x.



Edited by scottk (06/10/13 06:06 PM)


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Ira
Carpal Tunnel
*****

Reged: 08/22/10

Loc: Mitzpe Ramon, Israel
Re: If aliens had a telescope so powerful.... new [Re: scottk]
      #5913784 - 06/10/13 06:55 PM

It would be a PRISM telescope, and NSA already has one.

/Ira


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Ira
Carpal Tunnel
*****

Reged: 08/22/10

Loc: Mitzpe Ramon, Israel
Re: If aliens had a telescope so powerful.... new [Re: Ravenous]
      #5913792 - 06/10/13 07:01 PM

Quote:

Let's just say that its aperture would be so big, we could see it ourselves from here. (Well, almost.)




Assuming it is a single instrument, how large would the objective be?

/Ira


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Jarad
Postmaster
*****

Reged: 04/28/03

Loc: Atlanta, GA
Re: If aliens had a telescope so powerful.... new [Re: Ira]
      #5913828 - 06/10/13 07:22 PM

All I have to say is that climbing up and down the ladder to collimate is a real pain on my 10 light year f4.5...



Jarad


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shawnhar
Postmaster
*****

Reged: 06/25/10

Loc: Knoxville, TN
Re: If aliens had a telescope so powerful.... new [Re: Ira]
      #5913832 - 06/10/13 07:25 PM

The VLA reaches an angular resolution of about 0.2 seconds of arc, it is effectively a 22 mile diameter telescope.
Perfect theoretical resolution of a 10 meter scope, ignoring diffraction is 0.01 arc sec, you need millionths of an arsec to resolve a planet in orbit around another star in another galaxy?
5.9 billion km to Pluto, double that and maybe? Math ain't my strength.
An array would be feasable, but not a single instrument.
Maybe a quantum tunneling telescope with uncertainty optics?


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brentwood
Carpal Tunnel
*****

Reged: 11/04/05

Loc: BC Canada
Re: If aliens had a telescope so powerful.... [Re: shawnhar]
      #5913953 - 06/10/13 08:34 PM

....that even from a little over 2000 light years ago they could see in high details what was happening on Earth. If they also had sub-space radio and we had it too, we could settle once and for all some long standing differences of opinion!

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