IS28 Crossword
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
 
 
Down: 1) a quasi-stellar object: a small but powerful source of energy believed to be the active core of a very distant galaxy3) a galaxy that is round or elliptical in outline4) the brightness of a star as it appears to our eyes5) an imaginary sphere surrounding Earth to which the stars are attached9) the name of the galaxy to which we belong14) the distance light travels in one year16) the primordial explosion of space at the beginning of time18) a large assemblage of stars, interstellar gas, and dust Across: 2) the diagonal band of stars on an H-R diagram; such stars generate energy by fusing hydrogento helium5) the study of the origin ands structure of hte physical universe6) The farther away a galaxy is from Earth, the more rapidly it is moving away from us; V = H x d7) the explosion of a massive star caused by gravitational collapse with the emission of enormous quantities of matter8) a plot of intrinsic brightness versus surface temperature for stars10) the total amount of light energy that a star emits into space11) a disk-shaped galaxy with hot, bright stars and sprial arms. The Milky Way is a sprial galaxy.12) a galaxy with a chaotic appearance and with large clouds of gas and dust, but without spiral arms13) a pair of stars that orbit about a common center15) a dying star that has collapsed to the size of Earth and is slowly cooling off; located at the lower left on the H-R diagram16) the remains of a giant star that has collapsed upon itself, so dense, and with a gravitational field so intense, that light itself cannot escape from it17) cool giant stars above main-sequence stars on the H-R diagram19) an event wherein a white dwarf suddenly brightens and appears as a "new" star
 

 

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