Astronomy Ch.9 (Formation & Structure of Stars) Crossword
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
 
 
Down: 1) a cloud of glowing gas excited by ultraviolet radiation from hot stars3) the column of gas produced when a dense core of gas protects the nebula behind it from the energy of a nearby hot star that is evaporating and driving away a star-forming nebula4) the dimming of starlight by gas and dust in the interstellar medium5) the early contraction of a gas cloud to form a star during which internal pressure is too low to resist contraction8) one of the dark lines in some stellar spectra that are formed by interstellar gas12) the transfer of energy through a material as the flow of agitation among the particles. 16) a gas cloud around a forming star flattened by its rotation19) a small nebula that varies irregularly in brightness, believed to be associated with star formation20) the spectral emission line formed by electromagnetic energy with a radio wave-length of 21 cm emitted by cold, neutral hydrogen atoms in space21) a collapsing cloud of gas and dust destined to become a star22) in the HR diagram, the line above the main sequence where protostars first become visible25) a star whose mass is too low to ignite nuclear fusion and that is heated by contraction28) a glowing cloud of gas or a cloud of dust reflecting the light of nearby stars30) a table of numbers representing the conditions in various layers within a star 36) the resistance of a gas to the passage of radiation Across: 2) a large, loosely bound group of T Tauri stars6) energy that flows outward from a source; also, one of the three modes of energy transport inside stars (other two: convection and conduction)7) a series of nuclear reactions that use carbon as a catalyst to combine four hydrogen atoms to make one helium atom plus energy, effective in stars more massive than the sun9) jets of gas flowing away from a central object in opposite directions a term usually applied to protostars 10) group of widely scattered stars (10-100) moving together through space. not gravitationally bound into clusters 11) the process in which dust scatters blue light out of starlight and makes the stars look redder13) a young star surrounded by gas and dust, believed to be contracting toward the main sequence 14) a bright spectral line produced by excited interstellar gas viewed against a dark, cold background15) the cloud of gas and dust around a contracting protostar that conceals it at visible wavelengths17) a dense interstellar gas cloud in which atoms are able to link together to form molecules such as H2 and CO18) the dependence of gas pressure on gas temperature, which results in stability and regulation of energy production in the cores of normal stars23) the gas and dust distributed between stars24) a cloud of gas and dust seen silhouetted against a brighter nebula26) flow of energy from hot regions to cooler regions by one of three methods: conduction, convection, or radiation27) a forming star in a late protostellar evolutionary stage that has lost its obscuring cocoon of gas but is still contracting toward the main sequence 29) microscopic solid grains in the interstellar medium31) a loosely bound cluster of young stars having spectral types O and B, indicating a region of relatively recent star formation32) a region of ionized hydrogen around a hot star33) a nebula produced by starlight reflecting off dust particles in the interstellar medium34) the balance between the weight of the material pressing downward on a layer in a star and the pressure in that layer 35) small, dark cloud only about 1 ly in diameter that contains 10 to 1000 solar masses of gas and dust, believed to be related to star formation 37) very large, cool cloud of dense gas in which stars form38) circulation in a fluid driven by heat. hot material rises and cool material sinks39) the location of the HR diagram where stars first reach stability as hydrogen-burning stars40) a sudden change in pressure that travels as an intense sound wave
 

 

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