Jump to content


Photo

If aliens had a telescope so powerful....

  • Please log in to reply
43 replies to this topic

#1 scottk

scottk

    Ranger 4

  • -----
  • Posts: 399
  • Joined: 29 Aug 2009
  • Loc: Tennessee

Posted 10 June 2013 - 10:36 AM

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

#2 Ravenous

Ravenous

    Viking 1

  • -----
  • Posts: 518
  • Joined: 14 Nov 2009
  • Loc: UK

Posted 10 June 2013 - 10:41 AM

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

#3 Qwickdraw

Qwickdraw

    Surveyor 1

  • *****
  • Posts: 1717
  • Joined: 03 Mar 2012
  • Loc: Ann Arbor, MI

Posted 10 June 2013 - 10:44 AM

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

#4 Rudra

Rudra

    Vostok 1

  • -----
  • Posts: 181
  • Joined: 02 Jul 2010

Posted 10 June 2013 - 11:45 AM

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.

#5 llanitedave

llanitedave

    Humble Megalomaniac

  • *****
  • Posts: 22183
  • Joined: 25 Sep 2005
  • Loc: Amargosa Valley, NV, USA

Posted 10 June 2013 - 11:52 AM

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.

#6 shawnhar

shawnhar

    Fly Me to the Moon

  • *****
  • Posts: 5296
  • Joined: 25 Jun 2010
  • Loc: Knoxville, TN

Posted 10 June 2013 - 12:02 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.

#7 deSitter

deSitter

    Still in Old School

  • -----
  • Posts: 6879
  • Joined: 09 Dec 2004

Posted 10 June 2013 - 12:28 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

#8 scottk

scottk

    Ranger 4

  • -----
  • Posts: 399
  • Joined: 29 Aug 2009
  • Loc: Tennessee

Posted 10 June 2013 - 12:32 PM

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

#9 Rick Woods

Rick Woods

    Voyager 1

  • *****
  • Posts: 14391
  • Joined: 27 Jan 2005
  • Loc: Inner Solar System

Posted 10 June 2013 - 02:46 PM

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.

#10 scopethis

scopethis

    Cosmos

  • *****
  • Posts: 8144
  • Joined: 30 May 2008
  • Loc: Kingman, Ks

Posted 10 June 2013 - 02:49 PM

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

#11 Qwickdraw

Qwickdraw

    Surveyor 1

  • *****
  • Posts: 1717
  • Joined: 03 Mar 2012
  • Loc: Ann Arbor, MI

Posted 10 June 2013 - 03:57 PM

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.

#12 Pess

Pess

    (Title)

  • *****
  • Posts: 2872
  • Joined: 12 Sep 2007
  • Loc: Toledo, Ohio

Posted 10 June 2013 - 04:14 PM

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

#13 Mister T

Mister T

    Apollo

  • -----
  • Posts: 1312
  • Joined: 01 Feb 2008
  • Loc: Upstate NY

Posted 10 June 2013 - 04:25 PM

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

#14 llanitedave

llanitedave

    Humble Megalomaniac

  • *****
  • Posts: 22183
  • Joined: 25 Sep 2005
  • Loc: Amargosa Valley, NV, USA

Posted 10 June 2013 - 04:34 PM

$49.95

#15 scottk

scottk

    Ranger 4

  • -----
  • Posts: 399
  • Joined: 29 Aug 2009
  • Loc: Tennessee

Posted 10 June 2013 - 04:56 PM

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

:shocked:

#16 Ira

Ira

    Mercury-Atlas

  • *****
  • Posts: 2624
  • Joined: 22 Aug 2010
  • Loc: Mitzpe Ramon, Israel

Posted 10 June 2013 - 05:55 PM

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

/Ira

#17 Ira

Ira

    Mercury-Atlas

  • *****
  • Posts: 2624
  • Joined: 22 Aug 2010
  • Loc: Mitzpe Ramon, Israel

Posted 10 June 2013 - 06:01 PM

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

#18 Jarad

Jarad

    Fly Me to the Moon

  • *****
  • Posts: 6354
  • Joined: 28 Apr 2003
  • Loc: Atlanta, GA

Posted 10 June 2013 - 06:22 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...

:tonofbricks:

Jarad

#19 shawnhar

shawnhar

    Fly Me to the Moon

  • *****
  • Posts: 5296
  • Joined: 25 Jun 2010
  • Loc: Knoxville, TN

Posted 10 June 2013 - 06:25 PM

:pThe 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?

#20 brentwood

brentwood

    Mercury-Atlas

  • *****
  • Posts: 2530
  • Joined: 04 Nov 2005
  • Loc: BC Canada

Posted 10 June 2013 - 07:34 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!

#21 Ira

Ira

    Mercury-Atlas

  • *****
  • Posts: 2624
  • Joined: 22 Aug 2010
  • Loc: Mitzpe Ramon, Israel

Posted 10 June 2013 - 08:23 PM

It's this many miles in diameter: 1,830,808,080
to get a resolution of .000000000001 arc seconds.

Just a bit farther than the distance from earth to Saturn.
Deffinitely doable.

And No, you can't put it on a Vixen PortaMount.


/Ira

#22 deSitter

deSitter

    Still in Old School

  • -----
  • Posts: 6879
  • Joined: 09 Dec 2004

Posted 10 June 2013 - 08:47 PM

It's this many miles in diameter: 1,830,808,080
to get a resolution of .000000000001 arc seconds.

Just a bit farther than the distance from earth to Saturn.
Deffinitely doable.

And No, you can't put it on a Vixen PortaMount.


/Ira


:) nice!!

-drl

#23 Mister T

Mister T

    Apollo

  • -----
  • Posts: 1312
  • Joined: 01 Feb 2008
  • Loc: Upstate NY

Posted 11 June 2013 - 05:55 AM

and their would be "purists" who wouldn't look thru it without a Televue EP

#24 dyslexic nam

dyslexic nam

    Surveyor 1

  • *****
  • Posts: 1931
  • Joined: 28 Jan 2008
  • Loc: PEI, Canada

Posted 11 June 2013 - 06:30 AM

Explore Scientific has them listed but they have been on backorder for about 2 years now. :4

#25 Ravenous

Ravenous

    Viking 1

  • -----
  • Posts: 518
  • Joined: 14 Nov 2009
  • Loc: UK

Posted 11 June 2013 - 07:10 AM

and their would be "purists" who wouldn't look thru it without a Televue EP

Little Green Men prefer Big Green Eyepieces...






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics