Photos by E. E. Barnard, 

 Yerkes Observatory, Wisconsin 

 METEORS IN FLIGHT 

 The meteors are within our atmosphere, the many stars are millions of miles away. Reproduced from trans- 

 parencies in the American Museum. 



A rapidly moving meteor is hot only in a thin skin on the surface which takes fire and is blown away in the 

 onrush as fast as it burns, trailing behind as a stream of light. Iron meteors are so combustible that they may burn 

 like tinder in the oxygen compressed to high heat in front of them. Thus it is that small iron masses, moving rap- 

 idly, may burn entirely away and no fraction of them reach the ground 



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