Volume 1

A picture book of evolution / by Dennis Hird.

  • Dennis Hird
Date:
1906-1907
Catalogue details

Licence: Public Domain Mark

Credit: A picture book of evolution / by Dennis Hird. Source: Wellcome Collection.

    58/220 page 46
    therefore, to inquire whence comes the energy which supplies the heat of the sun. Unfortunately, it is not possible for many of us to grasp even partly what is implied by the sun’s heat, because we have such a feeble notion of the size of the sun. The sun’s diameter is 866,500 miles—i.e., 109^ times the diameter of our earth ; its area is 12,000 times Fig. 37.—One of the largest Sun spots. (After Flammarion.) the surface of the earth ; its volume or bulk is 1,300,000 times that of the earth—(Young, p. 197). In fact, if the sun were hollow, and the earth and moon could be placed inside it, the earth could rotate on its axis, and the moon go round her orbit, and yet not occupy half the sun’s internal space, as in Fig. 39.
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