In message u, Leonard
writes
In a discussion of getting to Andromeda in 10 minutes, no one (Julian
Moore) wrote:
...And assuming you accelerate for 5 minutes (with the intention of
decelerating at the half-way point) you might well be fried in the
Unruh radiation, but which gets you first on the cosmic Cannonball run
- that or the blue-shifted CMBR I'm not sure.

I'm not sure the Unruh temperature would be all that high if one
accelerates to near the
speed of light in 5 minutes.

It seems that by this rough calculation the unruh temperature would be
16 orders of magnitude less than room temperature.

(please correct me if I am mistaken) the Unruh temperature associated
with the acceleration
does not seem to be a problem.

[Moderator's note: This is quite right. The Unruh temperature
associated with an acceleration in which an object becomes
relativistic in five minutes is about 10^(-13) K. -TB]

Physics an interest not a speciality (apart from basic BSc), so I'm not
going to be correcting anyone here in the near future but now I know
something I didn't know before and didn't have a quick reference to
(Unruh calculation). Thanks

Julian