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*34) Although light travels 167,000 miles in a second, the distance
of 61 Cygni (the only star whose distance is ascertained) is so
inconceivably great, that its rays would require more than ten years to
reach the earth. For stars beyond this, 20--or even 1000 years--would
be a moderate estimate. Thus, if they had been annihilated 20, or 1000
years ago, we might still see them to-day by the light which started
from their surfaces 20 or 1000 years in the past time. That many which
we see daily are really extinct, is not impossible--not even improbable.
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