Astronomy CH.1 (Here and Now) Crossword
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
                          
 
 
Down: 1) the system of recording very large or very small numbers by using powers of 102) the reasoning style by which scientists test theories against evidence to understand how nature works3) long spiral pattern in a disk galaxy composed of bright stars, star clusters, gas, and dust. spiral arms extend from the center of the edge of the disk of spiral galaxies4) a small, nonluminous body formed by accretion in a disk around a protostar6) the spiral galaxy containing our sun; visible in the night sky as the milky way7) the area visible in an image. usually given as the diameter of the region9) the unit of DISTANCE light travels in 1 year10) the hazy band of light that circles our sky, produced by the glow of our galaxy12) a globe of gas held together by its own gravity and supported by the internal pressure of its hot gases, which generate energy by nuclear fusion Across: 5) includes everything: billions of galaxies, each containing billions of stars, and billions of planetary systems8) Average distance from Earth to the sun; (1.5 x 10^8 km or 93 x 10^6 mi)11) the sun and its planets, asteroids, comets, and so on; sun and its planets, including earth13) contains our solar system plus billions of stars and whatever planets orbit them14) a large system of stars, star clusters, gas, dust, and nebulae orbiting a common center of mass; a great cloud of stars, gas, and dust held together by the combined gravity of all of its matter
 

 

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