The young astronomer; or, The facts developed by modern astronomy, collected for the use of schools and the general reader (1847)
Abbott, John S. C. (John Stevens Cabot), 1805-1877 · New York, J.C. Riker [etc.] · leaf 85
Halleys Comet perform its revolution ?What is the size of this Comet ? Is it visible to the naked eye ? Howfar does its orbit extend ? When did this Comet make its last ap-pearance ? When will it again appear ? In what time does BielasComet perform its revolution ? What is said of other Comets ? 80… … The purposes which Comets are intended to subserveare entirely unknown. Various suppositions havebeen suggested by Astronomers, but none of them haveobtained any general approval. Sir Isaac Newton hasexpressed the opinion, that Comets were intended toreplenish Suns with the light and heat they lost…
Astronomy
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