....................................................................................................JULY 19




Here's a link to a video made only a few weeks ago by Don Lincoln of Fermilab, Chicago, USA. where he explains the phenomenon cited in my article last month by means of expanding space. Here, because we're moving away from the source of light (making the approach of that light, relative to us, less than 'c'), Don explains this by the idea that the space beween that source (ie, a distant galaxy) and us is continually expanding so increasing the distance the light has to travel:

If the universe is only 14 billion years old, how can it be 92 billion light years wide?

Who can say if Don's analysis is correct? It certainly explains a few issues that are otherwise obscure: the delay (as in my article) for one, while conserving a constant value for 'c', but others too: for instance, he includes the phenomenon of 'dark-matter'.

Here's another Don Lincoln video:

How to travel faster than light

If you goto 8-mins in, Don says light from galaxies >14 bn light-years away, which are receding at > 'c' (relative to us), can never reach us. This can only mean that light travels at 'c' relative to its source and nothing else, not even us >14 bn light-years distant who won't even receive that light if we wait 14 bn years..... Is there a differnece between a light source moving away faster than 'c' and space expanding faster than 'c'? And does it just apply to space at a vast distance, or can it apply to the relatively local?

When Don says that 'locally' (ie, presumably within, say, the Milky-Way galaxy) nothing can travel faster than light, he fails to specify that this applies only to what can be observed.

This was my comment on that video 23.7.19:

To go faster than light, if you have the technology and can tolerate the G-force, just keep accelerating in your rocket... if you have appropriate thrust then after a while you'll exceed 'c' and later '2c' and so on. Of course, your pals back on Earth will be unable to observe you exceeding 'c'... they'll just see 0.99... 'c' .... but you with your slower time than theirs will be going much faster than 'c' - you'll be able to go to Altair (16.7 light-years away) and back and age only, say, a couple of years, clear evidence you've travelled faster than 'c'. Just because your pals experience 50-years, say, while you're away is beside the point. The notion that the speed of anything in the universe can be limited according to what something else is doing some distance away is absurd. The fact is that anything can travel at any speed, it's just that it can never be observed moving faster than 'c'. Only indirectly by calculation or deduction from measurements taken at intervals, can we know when speed exceeds 'c'. Don's expanding space notion is an alternative explanation to the speed of light being relative only to its source, though the destination (even when zooming away from that source) will always measure that light to be travelling at 'c' when it reaches there - due to what, time dilation? So maybe distant galaxies are actually not as distant as we think?

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