settle those musicians in respect of the autumn
- From: unfortunately@xxxxxxxxxxxxx (William)
- Date: Fri, 8 Nov 2007 19:51:31 GMT
at it
in terms of light, or the vibrations which we call light and
sight. Light travels at a certain speed. As every scientist
knows, we see stars at night which may no longer be in
158
existence. Some of those stars are so very far away that the
light from them which is now reaching us may have started
on its journey before this Earth came into being. We have
no way of knowing if the star died a million or so years ago
because the light would still reach us for perhaps a million
more years. It might be easier to remind one of sound. We
see the flash of lightning and hear the sound some time
later. It is the slowness of sound which makes for the delay
in hearing it after seeing the flash. It is the slowness of
light which may make possible an instrument for "seeing"
the past.
If we could move instantly to a planet so far distant
that it took light one year to reach it from the planet
which we had just left, we would see light which had
started out one year before us. If we had some, as yet
imaginary, super-powerful, super-sensitive telescope with
which we could focus on any part of the Earth, we would
see events on Earth which were a year old. Given
.
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