Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 236
still have a low mean density, provided they are farenough apart. There is much reason, as we shall see, for supposingthat such is really the case, — that the comet is largely composed ofsmall meteoric stones, carrying with them a certain quantity of envel-oping gas. Another point should be… … Fm. 60.—Comet Spectra. (For convenience in engraving, the dark lines of the solar spectrum in the lowest stripof the figure are represented as bright.) swiftly as a stone. Interplanetary space is a vacuum farmore perfect than anything we can produce by air-pumps, andin it the lightest bodies move…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Catalogue des monuments et inscriptions de l'Égypte antique / publié sous les auspices de S.A. Abbas II Helmi par la direction générale du Service des antiquités [de l'Égypte] ; par J. de Morgan, U. Bouriant, G. Legrain, G. Jéquier, A. Barsanti (1894)](https://img.insideoutlibrary.com/img/200/ia-cataloguedesmonu22egyp-127-289.webp)
