Re: How far is Jupiter?

From	benj <benj.fake@gmail.com>
Newsgroups	sci.physics, sci.physics.relativity, alt.astronomy
Subject	Re: How far is Jupiter?
Date	2019-02-07 17:53 -0500
Organization	Aioe.org NNTP Server
Message-ID	<q3icu0$4pe$1@gioia.aioe.org> (permalink)
References	<5C59CDCC.244C@ix.netcom.com> <iljj5ehd8ere6sa357ee7nueq9qpc735f1@4ax.com> <gc1gopF4veU1@mid.individual.net> <q3hukm$2n2$1@gioia.aioe.org>

Cross-posted to 3 groups.

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On 2/7/2019 1:49 PM, Serg Io wrote:
> On 2/6/2019 7:42 PM, Sylvia Else wrote:
>> On 6/02/2019 5:04 am, Sir Gregory Hall,  Esq. wrote:
>>> On Tue, 05 Feb 2019 09:54:20 -0800, The Starmaker
>>> <starmaker@ix.netcom.com> wrote:
>>>> https://www.foxnews.com/science/harvard-prof-doesnt-back-down-from-claims-extraterrestrial-spacecraft-tech-is-flying-past-jupiter-orbit
>>>>
>>>>
>>>> i mean, if a flying saucer is near planet jupiter
>>>> how long will it take to get here on Earth?
>>>>
>>>> this week or next week?
>>>>
>>>> i'm not sure how you figure these things out...
>>>>
>>>> I didn't go to ...Harvard.
>>>
>>> Time-wise, Jupiter is very far. Given that to
>>> travel from Earth to Jupiter or vice versa, two
>>> things must be considered. Acceleration and
>>> declaration.  One thing that can't be left out
>>> of the equation is how much force can the
>>> organism or the ship handle. You don't want
>>> either to get squashed.
>>>
>>> So, realistically, from a human's standpoint,
>>> it would take years to travel from Jupiter
>>> to Earth.
>>>
>>
>> Jupiter's orbit averages about 5 AU which is also its average distance
>> from Earth.
>>
>> 1 AU is about 150 million kilometers, or 1.5 * 10^11 metres. So 5 AU is
>> about 7.5 * 10^11 metres. Call that s.
>>
>> Suppose the space ship accelerates at 1g (call that 10m/s^s, and let it
>> be a) for half the time, and decelerates at 1g for the other half. Let t
>> be the time the whole journey.
>>
>>      s/2 = 1/2 * a * (t/2)^2
>>
>>      t/2 = sqrt(s/2 / (1/2 * a))
>>
>>      t/2 = sqrt(s / a)
>>
>>      t = 2 * sqrt(s / a)
>>
>> Substituting for the terms, gives t = 2 * sqrt(10^11 / 10), or 2 * 10^5
>> seconds, or about 55 hours.
>>
>> The top speed reached is 10^6 metres per second, or 36 million
>> kilometres per hour, so the orbital speeds of Jupiter and the Earth are
>> negligible, as are relativistic effects. The course taken would be
>> pretty much a straight line.
>>
>> Zipping about the solar system would be quite practical if we could
>> maintain 1g over an entire journey. Only we can't, and there's no
>> realistic prospect of being able to do so.
>>
>> Sylvia.
>>
> 
> one can also limit/bound the problem of how far you can go, and # of
> turns you can make, in traveling in space by fuel mass.  It also bounds
> accelleration time.
> 
> one 90 degree turn, and you blew it, you have to start over, unless you
> use a planets gravity, or a stars gravity field to change direction.
> 
>         momentium vector
> 
> so starship enterprize is total science fiction, and has warped peoples
> views.

Warp drive is REAL. Odd can tell you that much.

> The laws of physics prevent man from freely traveling all over the
> universe.

Actually they don't, it's just that humans think they know all the laws 
of physics but barely have a clue. Our government is aware of this fact 
but it's classified.

Thread

How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-05 09:54 -0800
  Re: How far is Jupiter? Steve Dodds <sdodds@nova-optical.com> - 2019-02-05 10:57 -0700
  Re: How far is Jupiter? "Sir Gregory Hall,  Esq." <greghall@yacht_maester.fake> - 2019-02-05 13:04 -0500
    Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-05 23:54 -0800
      Re: How far is Jupiter? "Sir Gregory Hall,  Esq." <greghall@yacht_maester.fake> - 2019-02-06 10:21 -0500
        Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-06 14:55 -0800
          Re: How far is Jupiter? "Sir Gregory Hall,  Esq." <greghall@yacht_maester.fake> - 2019-02-06 18:16 -0500
            Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-06 16:45 -0800
              Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-06 16:56 -0800
            Re: How far is Jupiter? djheydt@kithrup.com (Dorothy J Heydt) - 2019-02-07 02:09 +0000
              Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-06 20:48 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-07 10:13 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-09 15:06 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-10 00:22 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-10 22:29 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-11 10:04 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-11 10:44 -0800
                Re: How far is Jupiter? pnalsing@gmail.com - 2019-02-11 19:29 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-12 09:08 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-14 00:17 -0800
                Re: How far is Jupiter? The Starmaker <starmaker@ix.netcom.com> - 2019-02-12 08:50 -0800
              Re: How far is Jupiter? Serg Io <invvalid@invalid.com> - 2019-02-07 17:09 -0600
                Re: How far is Jupiter? % <persent@gmail.com> - 2019-02-07 16:12 -0700
                Re: How far is Jupiter? benj <benj.fake@gmail.com> - 2019-02-07 22:24 -0500
                Re: How far is Jupiter? Serg Io <invvalid@invalid.com> - 2019-02-08 07:39 -0600
    Re: How far is Jupiter? Sylvia Else <sylvia@email.invalid> - 2019-02-07 12:42 +1100
      Re: How far is Jupiter? Serg Io <invvalid@invalid.com> - 2019-02-07 12:49 -0600
        Re: How far is Jupiter? benj <benj.fake@gmail.com> - 2019-02-07 17:53 -0500
          Re: How far is Jupiter? Serg Io <invvalid@invalid.com> - 2019-02-07 17:07 -0600
          Re: How far is Jupiter? Sylvia Else <sylvia@email.invalid> - 2019-02-08 16:52 +1100
            Re: How far is Jupiter? benj <benj.fake@gmail.com> - 2019-02-08 13:00 -0500
              Re: How far is Jupiter? Sylvia Else <sylvia@email.invalid> - 2019-02-09 11:22 +1100
          Re: How far is Jupiter? "Chris M. Thomasson" <invalid_chris_thomasson_invalid@invalid.com> - 2019-02-07 22:08 -0800
            Re: How far is Jupiter? Serg Io <invvalid@invalid.com> - 2019-02-08 07:46 -0600
  Re: How far is Jupiter? sam.wormley@gmail.com - 2019-02-05 10:52 -0800
    Re: How far is Jupiter? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-02-05 19:57 +0100
      Re: How far is Jupiter? Serg Io <invvalid@invalid.com> - 2019-02-05 14:03 -0600
        Re: How far is Jupiter? "Sir Gregory Hall,  Esq." <greghall@yacht_maester.fake> - 2019-02-05 17:42 -0500
          Re: How far is Jupiter? % <persent@gmail.com> - 2019-02-05 15:51 -0700
          Re: How far is Jupiter? Serg Io <invvalid@invalid.com> - 2019-02-05 17:30 -0600
        Re: How far is Jupiter? Mahipal <mahipal7638@gmail.com> - 2019-02-05 14:52 -0800
  Re: How far is Jupiter? "Bast" <fakename@nomail.invalid> - 2019-02-05 15:08 -0500
  Re: How far is Jupiter? Whisper <beaver999@ozemail.com> - 2019-02-06 14:05 +1100
    Re: How far is Jupiter? "Sir Gregory Hall,  Esq." <greghall@yacht_maester.fake> - 2019-02-06 10:23 -0500
      Re: How far is Jupiter? Whisper <beaver999@ozemail.com> - 2019-02-07 09:34 +1100
        Re: How far is Jupiter? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-02-07 00:54 +0100
  Re: How far is Jupiter? mitchrae3323@gmail.com - 2019-02-09 18:46 -0800

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