Yerkes Observatory University of Chicago P 

 THE HEAD OF A COMET MAY BE LARGER THAN THE EARTH 



A comet is a rare and unforgettable sight, with its bright, starlike head and long, 

 M.ny tail. The head probably consists of countless small meteorites, and the tail 

 of a rarefied gas. In its travels around the sun the same comet may become visible 

 from the earth a number of times, but centuries may elapse between these appear- 

 ances in some cases. The photograph above is of Daniel's Comet, sighted in 1907. 



