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From: Paul S Person <psperson@old.netcom.invalid>
Newsgroups: rec.arts.sf.written,rec.arts.comics.strips
Subject: Re: =?ISO-8859-1?Q?xkcd:_=93Moon_Landing?=
 =?ISO-8859-1?Q?_Mission_Profiles=94?=
Date: Sat, 23 Mar 2024 09:04:03 -0700
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On Fri, 22 Mar 2024 17:14:32 -0400, Cryptoengineer
<petertrei@gmail.com> wrote:

>On 3/21/2024 11:46 AM, Paul S Person wrote:
>> On Wed, 20 Mar 2024 14:03:02 -0500, Lynn McGuire
>> <lynnmcguire5@gmail.com> wrote:
>>=20
>>> xkcd: =93Moon Landing Mission Profiles=94
>>>      https://xkcd.com/2909/
>>>
>>> Explained at:
>>>
>>> =
https://www.explainxkcd.com/wiki/index.php/2909:_Moon_Landing_Mission_Pro=
files
>>>
>>> Moving the Moon closer would make a great space station and vacation =
spot.
>>>
>>> Until it broke up and then rained on the Earth for hundreds of years.
>>=20
>> And the stepladder suggestion seems to presuppose that the Moon is
>> both very close to the Earth and yet stationary relative to the Earth,
>> which might be harder to achieve then just contracting the orbit.
>
>The Earth-Moon Roche limit is 9600 km, center to center, or about 2000
>km surface to surface.
>
>  Any closer, and the moon would break up.
>
>At that height, the moon would orbit in about five and a half hours.
>
>Effects on the tides would be noticeable, about 1600x larger than now.

So, the stepladder suggestion (in the popup in the online comic) is
definitely out, then.
--=20
"Here lies the Tuscan poet Aretino,
Who evil spoke of everyone but God,
Giving as his excuse, 'I never knew him.'"