"Dirk Van de moortel" wrote
in message ...

"Simple Simon" wrote in message
.. .
Why is there no corresponding distance or mass phenomenon to the time
phenomenon of the "Twins Paradox" ? Where is the asymmetry?

I've seen a condition that space is isotropic but space and time are
homogeneous (isn't time also isotropic?) If this explains the lack of
symmetry, how does it do so?

According to the stay-at-home twin the trip takes a time T
and the total distance covered is L.
According to the travelling twin the trap takes a time T/gamma
and the total distance covered is L/gamma.
So there is no "lack of symmetry" between space and time.

Mass is an invariant:
http://math.ucr.edu/home/baez/physic...y/SR/mass.html

[followup set to sci.physics.relativity]

Dirk Vdm


I think that I see. I guess that I'm confusing time with clocks, and that
clocks have a
history of time passed, while devices for measuring distance suffer from
none of the same. And while the travelling twin is younger, he/she is not
smaller since no growth while travelling (and staying at home) occurs,
assuming he/she is fully
grown before travelling.