The Sun

Cover The Sun
The Sun
Ralph Allen Sampson
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After further examination, these have been re- arranged into an order which really appears to belong to a sequence of development. We begin with the gaseous nebulae. These contain a gas, unknown upon earth except through Nicholson's theory, and also hydrogen and helium. An organic part of certain nebulae, as for example the great nebulae in Orion, are stars, and these may be supposed to represent the earliest stellar type. Thus we have the Orion stars, which show faint and diffuse lines of heli
...um and hydrogen that is, Class B ; after this, not before it, comes Class A, in which as the helium lines die out, the hydrogen lines attain their maximum intensity ; Sirius, and indeed most of the brightest stars are of this type. These are the Hydrogen or Sirian stars. They show white or bluish in the sky, but the name white stars does not distinguish them sufficiently for it includes the next class also, the Calcium stars of Class F, of which Altair and Procyon are examples. The solar stars of Class G have a yellowish tinge ; Capella is the type for these.

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