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5 ATHENA ch 16 Scott Foresman 2008

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terms
definitions
light-year   the distance light travels in one year  
nebula   a cloud of gas and dust in which new stars form  
supernova   a gigantic explosion that occurs near the end of the life of some stars  
black hole   a point in space that has such a strong force of gravity that nothing within a certain distance of it can escape  
galaxy   a huge system of stars, dust, and gas held together by gravity  
constellation   a group of stars that forms a pattern  


   


 

 

 

 

 

 
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