. Elementary physical geography . n, and it isestimated that over 30,000,000 are visible with the the sun, they emit an energy which produces bothlight and heat; and it is very probable that many, ifnot all, have planetary bodies revolving about satellite, that belonging to Sirius, has already been dis-covered ; and some doublestars are known to be re-volving about a commoncenter of gravity. Thedistance between the stars,and even between the earthand the nearest stars, is im-mense, and in most cases in-calculable. If each star isa sun with accompanyingplanets, and if ea
. Elementary physical geography . n, and it isestimated that over 30,000,000 are visible with the the sun, they emit an energy which produces bothlight and heat; and it is very probable that many, ifnot all, have planetary bodies revolving about satellite, that belonging to Sirius, has already been dis-covered ; and some doublestars are known to be re-volving about a commoncenter of gravity. Thedistance between the stars,and even between the earthand the nearest stars, is im-mense, and in most cases in-calculable. If each star isa sun with accompanyingplanets, and if each of thesesuns is as far from its near-est stellar neighbors as weare from ours, the immensityand grandeur of the systemtranscends our imagination. The stars are arranged ina disc-like belt, the greatestdiameter of which is in the direction of the Milky right angles to this there is a zone of abundant nebulce,(Fig. 13), although these strange bodies are not absent fromother parts of the heavens. Some have conjectured that. Fig. nebula, from a drawing. 18 PHYSICAL GEOGRAPHY. nebulae are other stellar systems, so distant from us thatthe individual members cannot be separated by our tele-scopes ; but the spectroscope seems to show that they arebodies of glowing gas, and this has an important bearingupon the nebular hypothesis, which we soon discuss. Onevery important thing concerning both stars and nebulas, isthat the spectroscope has detected in them many of theelements which we find upon the earth. A question of very deep interest, is whether the stars forma great system in which the individual members are inter-related, as is the case among the members of the solarsystem ? Unfortunately, in the present state of science, weare unable to return a definite answer to this question. Symmetry of the Solar System. — In theorizing upon abasis of known facts we must confine ourselves to the solarsystem; and it is interesting to note the wonderful symmetryof arrang
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