Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 156
Mercury. It was a verylong and a very hard sum, but at last his calculationsarrived at the answer, and showed that Mercury must be a The Inner Planets. t4i light globe compared to the earth. In fact, it would taketwenty-five globes, each equal to Mercury, to weigh as muchas the earth. I daresay you… … Fig. 48. of sugar. Supposing, however, we had to weigh a mountain,or rather a body, which was bigger than fifty thousandmountains, and which was also many millions of milesaway, all sorts of expedients would have to be resortedto. I have told you one of them. If you feel any doubtsas to the…
Astronomy
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