The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 133
t than to about a thousandth of the density of airat the earths surface; and the lunar atmosphere, if it existsat all, is thus proved to be twice as attenuated as what wecommonly call a vacuum. 114 ASTRONOMY. The Surface of the Moon. 112. Dusky Patches on the Disk of the Moon. — Withthe naked eye,… … supposed to be seas. This theory was the origin of thename mare (Latin for sea), which is still applied to thelarger of these plains; but, if there were water on the sur-face of the moon, it could not fail to manifest its presenceby its vapor, which would form an appreciable atmosphere.Moreover,…
Astronomy
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