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Orchid XP v8 wrote:
> So I suppose "how many points are there on the unit square" comes down
> to "are the coordinates rational?"
Draw a dot at sqrt(2),sqrt(2).
> Oh. You mean something *outside* the mass itself causes it to become a
> black hole?
Yes.
> But then, wouldn't that just mean that as soon as you remove the force,
> it wouldn't be a black hole any more?
No. Science!
(Altho there's arguments over whether quantum effects would eventually make
a black hole too small to form on its own evaporate, but I didn't take that
to be what you meant.)
>> Sure, the relative speed of light can even be superluminal.
>
> No, it cannot.
It can travel faster than the speed of light in the medium in which it's
traveling.
> This is exactly what relativity states. The speed of light, no matter
> which way you measure it, is always constant. (Except as noted below.)
The speed of light in a vacuum is always constant. That doesn't mean it
can't travel faster than the speed of light in the medium in which it is
traveling.
> This part is correct. And I would expect light entering or leaving a
> different medium to exhibit Doppler shift as a result (although it
> doesn't seem to do this...)
That's not how light slows down. Light slows because it is being absorbed
and re-emitted, not because the speed per se is different in different
media. The train always travels the same speed - but sometimes it stops at
more stations.
> Wait - you actually use a sophisticated electronic accounting package
> just for your home finance?
Yes. It's not all that sophisticated.
--
Darren New, San Diego CA, USA (PST)
"How did he die?" "He got shot in the hand."
"That was fatal?"
"He was holding a live grenade at the time."
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