The pith of astronomy <without mathematics>; the latest facts and figures as developed by the giant telescopes; (1896)
Bayne, Samuel G. (Samuel Gamble), 1844-1924 · New York, Harper & brothers · leaf 40
rs of heat from the sun ontheir way to the earth pass through apractical vacuum which has a tempera-ture of 300 or 400 degrees below zero; … RELATIVE SIZES OF THE SUN AND PLANETS THE SUN 13 they pass through this temperature andhave apparently no effect until theymeet some object, like the earth, capa-ble of being warmed by them. The sun has prodigious activity in itsspots. These spots are sometimes 50,000miles in diameter, and it is by…
Astronomy
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