On Tuesday, May 18, 2021 at 1:20:09 AM UTC-7, Daniel65 wrote:
R Kym Horsell wrote on 18/5/21 1:09 am:
In alt.astronomy Bast wrote:
Amazing how the whole point of this thread continues to be missed,
that distances are FAR too great for any practical travel between
stars, even in the very unlikely event of traveling near light speed,
or of any communications. All experience so far has confirmed this.
You mean,......SO FAR
It was not that long ago the same thought about being impossible was said
about beng able to travel at speeds of over 30 miles per hour......
Until it happened.
If I have missed the point that some people willl always refuse to believe
that limits are only something thet has not been figured out yet, then you
Wait until we discover that light actually can travel faster than "C", and
it's medium is actually the "stuff" we now wrongly call "dark matter".
Sounds a bit speculative.
We know the speed of light in a vacuum is faster than the speed of
light in a material with a refractive index 1.
But we also know the vacuum is nowhere near empty -- there are virtual
particles, mostly electron/positron paris, jamming around any photon
trying to motor along. If you had a "real" quantum vaccum then you
might find photons moved faster.
O.K., pick me, I'll ask the question that everyone's thinking!! (My
theory is ... "The only dumb question is the question that goes unasked!!)
Doesn't a 'photon' have Mass?? If so, then how could 'a "real" quantum
vacuum' possibly contain a photon??
A photon has no mass but it does have momentum. Recall that nothing with mass can attain the speed of light.