m 



Solcrr and Planetary Evolution. 



tain region on either side of the sun's equator ; these regions 

 are like broad bands parallel with the equator. (See Fig- 

 ure 10, page 65.) 



(A photographic picture of the planet Jupiter is thrown 

 on the screen. See illustration, Figure 11, below.) Ju- 

 piter, which has only recently passed out of the condition 

 which the sun is now in, shows bands in its cloudy envelope, 

 which cover regions similar to those on the sun where spots 

 appear, and foreshadows what will be the fate of the sun 

 when it shall lose its brilliancy and become dark and dead. 

 Jupiter being smaller than the sun, cooled sooner j but the 



Tig. 11. The planet Jupiter, showing belts, and size as compared with the earth. 



sun, astronomers tell us, will follow in the same path. The 

 end of all will be that the sun will become a great planet, 

 like Jupiter, but differing from the other planets, as we see 

 them, in that it will have no light to reflect. What a theme 

 for another Milton ! This great and generous sun, which 

 has shed his light without stint on all around him, gilding 

 even the dust of space, shall be robbed and stript of his 

 splendor, and go wandering blindly through the heavens, 

 dragging after him the dead worlds that once basked in his 

 beams. 



The earth, as we know it, illustrates the next step in de- 



