The Golden Book Encyclopedia
Astronomes describe a galaxy as a glant cluster of stars. A galaxy may contain billions or even trillions of stars. Its diameter may range form a few thousand to a half-billion light years. A light-years us the distance that light travels in a year-about 9 1/2 trilion kilometers ( 5 trilion miles ).
Vydavateľ : Publishers of Golden Books
ISBN : 0-307-70108-5
Väzba : pevná lesklá
Jazyk : anglický
Stav : zachovalá
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