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| Table of Contents | Enchanted Learning All About Astronomy |
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A planetary year is the length of time it takes that planet to revolve around the sun. |
 YELLOW DWARF Yellow dwarfs are small, main sequence stars. The Sun is a yellow dwarf. |
YERKES OBSERVATORY University of Chicago's Yerkes Observatory is an astronomical observatory located at Williams Bay, Wisconsin, USA. It has a 40 inch (102 cm) refracting telescope; this is the largest refractor in the world. The Observatory was named for Charles Tyson Yerkes (1837-1905), a Chicago transportation tycoon who financed it. The observatory was designed by George E. Hale in 1892. |
YLEM Ylem (or Yelm) is the name given to the hypothetical primordial matter from which all the elements have formed. George Gamow proposed the existence of ylem. |
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