Astronomy final Crossword
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
 
 
Down: 2) Edwin Hubble Across: 1) quasar3) primarily old, metal-poor stars4) small central bulge and loosely wound spiral arms.5) The optical path through the gravitational lens producing one image is longer than that for the other image.6) be almost perfectly placed on a line between Earth and the quasar7) Albert Einstein 8) Elliptical galaxies have a disk and a central bulge but no spiral arms.9) day10) Sa11) irregular galaxies12) have very bright, very hot starlike central cores with variable energy output13) infrared 14) size of the nuclear bulge15) normal spiral16) extreme redshift of visible Balmer and UV Lyman hydrogen emission lines, indicating high recessional velocities and hence, by the Hubble law, very large distances17) expansion of space, stretching the photon’s wavelength while the photon is traveling toward Earth18) elliptical galaxy19) While the electromagnetic force of a charged particle has an infinite range, it is usually screened (and limited) by the existence of charges of the opposite sign. Ordinary matter has only one sign and therefore does not screen other gravitational forces.20) they contain no gas and dust clouds or young, hot stars.21) The Milky Way has at least four spiral arms, whereas most galaxies have only two.22) barred spiral23) Spacetime is something real, with galaxies inside it; as spacetime expands, the galaxies (or superclusters of galaxies) are carried along by the expansion.24) spiral galaxy classification25) Sc 26) The most loosely wound galaxy, Sc, has the most dust and gas in its arms.27) irregular galaxies28) the double image of a single source behind the galaxy produced by gravitational lensing by the galaxy.
 

 

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