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Table of Contents Enchanted Learning
All About Astronomy
Site Index
Our Solar System Stars Glossary Printables, Worksheets, and Activities
The Sun The Planets The Moon Asteroids Kuiper Belt Comets Meteors Astronomers

Astronomy Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.

Y

Planet YEAR
Mercury 87.96 Earth days
Venus 224.68 Earth days
Earth 365.26 Earth days
Mars 686.98 Earth days
Jupiter 11.862 Earth years
Saturn 29.456 Earth years
Uranus 84.07 Earth years
Neptune 164.81 Earth years
Pluto 247.7 Earth years
YEAR
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.
Astronomy Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the astronomy term you are looking for is not in the dictionary, please e-mail us.

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