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Re: To see instantaneously from the moon on Earth

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On 15/06/2018 11:55 AM, John Gogo wrote:
> On Wednesday, June 13, 2018 at 10:13:32 PM UTC-5, Sylvia Else wrote:
>> On 14/06/2018 11:59 AM, John Gogo wrote:
>>> On Tuesday, June 12, 2018 at 11:48:08 PM UTC-5, Sylvia Else wrote:
>>>> On 13/06/2018 1:16 PM, Sylvia Else wrote:
>>>>> On 13/06/2018 11:39 AM, John Gogo wrote:
>>>>>> On Monday, June 11, 2018 at 11:59:46 PM UTC-5, tjrob137 wrote:
>>>>>>> On 6/11/18 7:14 PM, John Gogo wrote:
>>>>>>>> Tom Roberts said that we now can produce a telescope which can see
>>>>>>>> the detail of the moon's surface within a few inches.
>>>>>>>
>>>>>>> I did NOT say that at all, and it is far from true. A telescope able to
>>>>>>> see an LED on the moon is NOT AT ALL able to "see the detail of the
>>>>>>> moon's surface within a few inches".
>>>>>>>
>>>>>>>       Do you understand that light-gathering power is not at all
>>>>>>>       the same as angular resolution? Do you even know what
>>>>>>>       these terms mean?
>>>>>>>
>>>>>>> Why do you just make stuff up and pretend it is true? What's the point?
>>>>>>> Lying about what somebody else said is downright unfriendly. And STUPID.
>>>>>>>
>>>>>>> Tom Roberts
>>>>>>
>>>>>> Tom, you also said that an ordinary LED a few millimeters in diameter,
>>>>>> pointed in the direction of the Keck telescope, would be significantly
>>>>>> brighter there than a candle. You also said it would require solar
>>>>>> darkness. C'mon Tom throw me a bone. Can or cannot we build a
>>>>>> telescope powerful and special enough to literally SEE the rovers,
>>>>>> mirrors, flags, and the like to be observed by any human here on Earth?
>>>>>>
>>>>>
>>>>>
>>>>> No, we cannot. It would have to be bigger than the Earth itself.
>>>>>
>>>>> Sylvia.
>>>>
>>>> Oops - lost a factor of a 1000.
>>>>
>>>> Still, an optical telescope 19km across is hardly practical.
>>>>
>>>> Sylvia.
>>>
>>> We are so limited and short-sighted aren't we? No wonder we are not ready for instant light.
>>>
>>
>> Not sure what you mean by that. The required size arises from a
>> fundamental aspect of optics, or, equivalently, quantum mechanics. No
>> smaller telescope can have sufficient resolution.
>>
>> If someone contrived to pay for and build a functional optical telescope
>> that big, it would not be for the purpose of convincing moon-landing
>> deniers.
>>
>> Sylvia.
> 
> The theory is simple. A self emitting object such as a star, or a self illuminating object such as the Earth do not change in size. But, as a powerful telescope travels farther and farther toward absolute darkness, the same objects (sun and Earth) become brighter.
> 

If you just want to know whether something is there, then it clearly 
helps if it is brighter. But if you want to see it in detail with some 
level of resolution, then making brighter doesn't help. You need a 
telescope that is large enough to achieve that resolution, and the 
required size is determined by the laws of optics.

Sylvia.

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Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-02 16:26 -0700
  Re: To see instantaneously from the moon on Earth Python <python@python.invalid> - 2018-06-03 01:49 +0200
  Re: To see instantaneously from the moon on Earth Edward Prochak <edprochak@gmail.com> - 2018-06-04 09:45 -0700
    Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-04 19:19 -0700
    Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-07 18:29 -0700
  Re: To see instantaneously from the moon on Earth Sylvia Else <sylvia@not.at.this.address> - 2018-06-11 11:30 +1000
    Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-11 17:14 -0700
      Re: To see instantaneously from the moon on Earth Sylvia Else <sylvia@not.at.this.address> - 2018-06-12 14:33 +1000
      Re: To see instantaneously from the moon on Earth Tom Roberts <tjroberts137@sbcglobal.net> - 2018-06-11 23:59 -0500
        Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-12 18:39 -0700
          Re: To see instantaneously from the moon on Earth Sylvia Else <sylvia@not.at.this.address> - 2018-06-13 13:16 +1000
            Re: To see instantaneously from the moon on Earth Sylvia Else <sylvia@not.at.this.address> - 2018-06-13 14:48 +1000
              Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-13 18:59 -0700
                Re: To see instantaneously from the moon on Earth Gary Harnagel <hitlong@yahoo.com> - 2018-06-13 19:19 -0700
                Re: To see instantaneously from the moon on Earth Sylvia Else <sylvia@not.at.this.address> - 2018-06-14 13:13 +1000
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-14 18:55 -0700
                Re: To see instantaneously from the moon on Earth Sylvia Else <sylvia@not.at.this.address> - 2018-06-16 09:14 +1000
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-15 19:05 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-15 19:24 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-15 19:39 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-16 20:11 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-16 20:31 -0700
                Re: To see instantaneously from the moon on Earth Sylvia Else <sylvia@not.at.this.address> - 2018-06-17 14:42 +1000
                Re: To see instantaneously from the moon on Earth Edward Prochak <edprochak@gmail.com> - 2018-06-17 18:23 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-18 17:39 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-18 19:09 -0700
                Re: To see instantaneously from the moon on Earth Edward Prochak <edprochak@gmail.com> - 2018-06-19 09:55 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-20 15:46 -0700
                Re: To see instantaneously from the moon on Earth Edward Prochak <edprochak@gmail.com> - 2018-06-21 10:10 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-25 19:14 -0700
                Re: To see instantaneously from the moon on Earth mitchrae3323@gmail.com - 2018-06-25 19:23 -0700
                Re: To see instantaneously from the moon on Earth pnalsing@gmail.com - 2018-06-25 22:38 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-30 21:02 -0700
                Re: To see instantaneously from the moon on Earth pnalsing@gmail.com - 2018-06-30 21:28 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-30 22:02 -0700
                Re: To see instantaneously from the moon on Earth pnalsing@gmail.com - 2018-07-01 17:04 -0700
                Re: To see instantaneously from the moon on Earth Edward Prochak <edprochak@gmail.com> - 2018-07-01 18:34 -0700
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-07-01 19:43 -0700
                Re: To see instantaneously from the moon on Earth Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-07-01 12:20 +0200
                Re: To see instantaneously from the moon on Earth pnalsing@gmail.com - 2018-07-01 17:04 -0700
                Re: To see instantaneously from the moon on Earth Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-07-02 03:55 +0200
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-07-01 19:39 -0700
                Re: To see instantaneously from the moon on Earth Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-07-02 04:42 +0200
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-07-01 19:51 -0700
                Re: To see instantaneously from the moon on Earth Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-07-02 05:04 +0200
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-07-01 20:58 -0700
                Re: To see instantaneously from the moon on Earth pnalsing@gmail.com - 2018-07-01 20:26 -0700
          Re: To see instantaneously from the moon on Earth Tom Roberts <tjroberts137@sbcglobal.net> - 2018-06-12 22:18 -0500
            Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-13 19:23 -0700
              Re: To see instantaneously from the moon on Earth Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-07-02 04:37 +0200
            Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-16 20:20 -0700
              Re: To see instantaneously from the moon on Earth Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-07-02 04:40 +0200
          Re: To see instantaneously from the moon on Earth Steve BH <sbharris@gmail.com> - 2018-06-18 08:35 -0700
            Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-18 17:33 -0700
              Re: To see instantaneously from the moon on Earth Steve BH <sbharris@gmail.com> - 2018-06-19 10:26 -0700
                Re: To see instantaneously from the moon on Earth Zprávn Udoucih <zpnvn@nwinst.ce> - 2018-06-19 17:32 +0000
                Re: To see instantaneously from the moon on Earth John Gogo <jfgogo22@yahoo.com> - 2018-06-20 16:12 -0700

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