Quotation from: General Science

Written by: Bertha M. Clark


While the amount of energy received daily from the sun by the earth is
actually enormous, it is small in comparison with the whole amount
given out by the sun to the numerous heavenly bodies which make up the
universe. In fact, of the entire outflow of heat and light, the earth
receives only one part in two thousand million, and this is a very
small portion indeed.


139. How Light and Heat Travel from the Sun to Us. Astronomers tell
us that the sun--the chief source of heat and light--is 93,000,000
miles away from us; that is, so far distant that the fastest express
train would require about 176 years to reach the sun. How do heat and
light travel through this vast abyss of space?

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