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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Unseen World and Other Essays by John Fiske: the remotest star which the telescope can reach. Whether there
are any bounds at all to this ethereal ocean, or whether it is as
infinite as space itself, we cannot surmise. If it be limited,
the possible dispersion of radiant energy is limited by its
extent. Heat and light cannot travel through emptiness. If the
ether is bounded by surrounding emptiness, then a ray of heat, on
arriving at this limiting emptiness, would be reflected back as
surely as a ball is sent back when thrown against a solid wall.
If this be the case, it will not affect our conclusions
concerning such a tiny region of space as is occupied by the
solar system, but it will seriously modify Sir William Thomson's
The Unseen World and Other Essays |
