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.

    56/220 page 44
    huge nebulous mass extending far beyond the orbit of Neptune, and that this mass must have been 200 million times less dense than hydrogen, which is the lightest gas we know. In Fig. 35 we see the sun with spots, but this conveys no idea of their vast size. In Fig. 36 there are two spots, one above and one below the equator. These look like two rows Fig. 35.—The Sun with spots. (After Flammarion.) of spots, because the two spots are being carried round by the rotation of the sun. In fact, they afford us the means of measuring the time which the sun takes to rotate on its axis. In Fig. 37 is seen one of the largest sun spots. You can form some idea of its size by comparing it with the size of the earth at the top left-hand corner.
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