Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 376
its tail was100,000,000 miles long and 15,000,000 miles in diameter.The phenomena connected with it suggested to Olbers theelectrical repulsion theory of comets tails. Enckes Comet (1819). — Enckes comet was the firstmember of Jupiters family to be discovered, and it has ashorter period (3.3 years)… … Fig. 125. — Enckes comet (Barnard). 330 AN INTRODUCTION TO ASTRONOMY [ch. x, 200 about 2.5 hours at each revolution until 1868; since thattime the change in the period of revolution has been only-one half as great. The change in volume of Enckes cometat times was extraordinary. On October 28, 1828,…
Astronomy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
