> Yes, this stuff is exciting!
>
> And even better, "Negative Gravity" has been located already in space,
> at an asteroid nearby:
> https://www.google.com/search?q=Asteroid+Negative+Gravity
>
> :-)
>

There is no such thing as negative gravity.

But... There are cases where it may /look/ as if there is:
A small space object is rotating fast enough that the tengential speed 
at it's surface is larger than it's escape velicity.
Only possible if the object is small enough that it's mecanical strength 
is higher than the centrifugal force.
In the case of 1950DA asteroid, it looks like the Van Der Waal 
interaction could be strong enough. Then again, it may actualy be one 
big rock held together by purely mechanical force but that look like 
it's more gravel like.

On a another scale, radiation pressure can overcome gravity.
That's a major factor in the solar wind.
At a cosmological scale, it can actualy push whole galaxies away from 
one another.

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