A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveries. Adapted to the use of schools and academies, and of the general reader (1850)
Olmsted, Denison, 1791-1859 · New York, R. B. Collins · leaf 262
e latter of much less confi-dence. Changes, however, are going on m some of thenebulae, which plainly show that they are not, t&e plan-ets and stars, fixed and permanent creations. 1 nus thecrreat nebula in the girdle of Andromeda, has very muchaltered its structure since it first became an… … ter, (Fig. 51,) the anterior boundary being irregular,and the central parts more nearly spherical. 307. What is said of Herschels speculations and of his ob-servations ? What changes occur in the nebulae? Whatforms have they ? 250 FIXED STARS. 308. The nebula in the sword of Orion is…
Astronomy
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