Date: Mon, 3 Jun 2013 00:49:17 -0400
Subject: [WSFA] Re: negative gravity
From: Michael Walsh <walshmichaelj at gmail.com>
To: WSFA members <WSFAlist at keithlynch.net>
Reply-To: WSFA members <WSFAlist at KeithLynch.net>

Negative gravity really sucks.

mjw

On Mon, Jun 3, 2013 at 12:41 AM, Mike B. <yahoo at omniphile.com> wrote:
> Dark energy is the name for the unknown cause of what appears to be a
> repulsive force at very large scales (i.e. between galactic clusters).
> Whether it is negative gravity, or something else, is as unknown as
> whether it even exists as a force of any type (as opposed to say, a
> side-effect of a non-uniform expansion of space).
>
> I wouldn't refer to a gravitational reading that is less than a
> reference level as "negative gravity"...since it is still a reading of
> the usual attractive gravitational force, which has a positive value.
> Referring to such a reading as being lower than a reference reading is
> fine, and using negative numbers to record such a relative reading makes
> sense, but "negative gravity"?  I don't think so.  I think that's an
> invention of the reporter, stemming from lack of understanding of either
> the subject matter, or English, or perhaps both.
>
> -- Mike B.
>
> On 6/1/2013 8:27 PM, Ron Kean wrote:
>> In the case of a gravity map, negative and positive readings would
>> probably be relative to a mean gravity reference strength.
>>
>> In a larger context, negative gravity can be a manifestation of dark
>> energy.
>>
>> http://www.nytimes.com/2001/04/03/us/photo-gives-weight-to-einstein-s-the
>> sis-of-negative-gravity.html
>>
>> Ron Kean
>>
>> On Sat, 01 Jun 2013 14:03:56 -0400 "Mike B." <yahoo at omniphile.com>
>> writes:
>>> On 5/31/2013 6:58 PM, mark wrote:
>>>> Using high-resolution gravity data from NASA's Gravity Recovery
>>> and
>>>> Interior Laboratory (GRAIL) mission, researchers at MIT and
>>> Purdue
>>>> University have mapped the structure of several lunar mascons and
>>> found
>>>> that their gravitational fields resemble a bull's-eye pattern: a
>>> center of
>>>> strong, or positive, gravity surrounded by alternating rings of
>>> negative
>>>> and positive gravity.
>>>
>>> "Negative and positive gravity"????  What the hell is "negative
>>> gravity"??  I'm surprised that got through in an MIT publication.
>>>
>>> I suspect that they meant increasing and decreasing levels of
>>> attraction, not negative gravity.
>>>
>>> -- Mike B.
>>>
>>
>