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From: Thomas Heger <ttt_heg@web.de>
Newsgroups: sci.physics.relativity
Subject: Re: The mass-velocity relationship and the light speed speed limit.
Date: Tue, 11 Mar 2025 07:33:27 +0100
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Am Dienstag000011, 11.03.2025 um 05:25 schrieb LaurenceClarkCrossen:
> The more massive it became, the more rapidly it would orbit anything
> bigger than it until it moved faster than light. Some stars spin faster
> than light.

Velocity is always 'relative', or 'frame dependent'.

A particles has therefore no 'rest mass' and no 'absolute velocity'.

To talk about velocity would require to say, in respect to what that 
velocity shall be measured.

There are two obvious possibilities in respect to which the particles 
could be in motion:

the observer
the particle itself

'The universe' is not possible as reference, because the universe does 
not contain points, which do not move.

Usually the observer is regarded as being at rest and placed in the 
center of his won coordinate system, because the other possibility is a 
little pointless as the particle does not move in respect to itself.

TH