Chapter 12 Vocabulary Crossword
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
 
 
Down: 1) measure of the amount of light from a star that is received on earth4) final stage in the evolution of a very massive star, where the core's mass collapses to a point that its gravity is so strong that not even light can escape5) outermost, largest layer of the sun's atmosphere; extends millions of kilometers into space and has temperatures up to 2 million k7) late stage in the life of a comparatively low-mass main sequence star in which hydrogen in the core is deleted, the core contracts, and temperatures inside the star increase, causing its outer layers to expand and cool8) collapsed core of a supernova that can shrink to about 20 km in diameter and contains only neutrons in the dense core10) large collection of stars, dust, and gas held together by gravitation11) late stage in the life cycle of a massive star in which the core heats up, heavy elements form by fusion, and the star expands; can eventually explode to form a supernova Across: 2) lowest layer of the sun's atmosphere; gives off light and has temperatures of about 6,000 k3) layer of the sun's atmosphere above the photosphere6) pattern of stars that is named as a group and forms an imaginary shape or figure9) large cloud of gas and dust that contracts under gravitational force and breaks apart into smaller pieces, each of which might collapse to form a star12) measure of the amount of light a star actually gives off13) instrument that separates light into its component colors14) late stage in the life cycle of a comparatively low-mass main sequence star; formed when its core depletes its helium and its outer layers escape into space, leaving behind a hot, dense core15) areas on the sun's surface that are cooler and less bright than surrounding areas, are caused by the sun's magnetic field, and occur in cycles
 

 

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