Astronomy Ch.11 (Neutron stars & black holes) Crossword
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
                                      
 
 
Down: 1) the boundary of the region of a black hole from which no radiation may escape. no event that occurs within the event horizon is visible to a distance observer2) a source of short, precisely timed radio burst, believed to be spinning neutron stars 3) the lengthening of the wavelength of a photon due to its escape from a gravitational field4) the breeze of high energy particles flowing away from a spinning neutron star6) the slowing of moving clocks or clocks in strong gravitational fields7) a sudden, powerful burst of gamma rays9) the explanation of a pulsar as a spilling neutron star sweeping beams of electromagnetic radiation around the sky12) the object of zero radius into which the matter in a black hole is believed to fall14) a class of neutron star having a very strong magnetic field Across: 5) an object that produces repeated burst of x-rays8) produced when a very massive star collapses into a black hole. thought to be a possible source of gamma-ray bursts10) disturbances in a gravitational field traveling at the velocity of light and carrying energy away from an object with a rapidly changing mass distribution 11) a pulsar with a pulse period of only a few milliseconds 13) a mass that has collapsed to such a small volume that its gravity prevents the escape of all radiation. also, the volume of space from which radiation may not escape15) the radius of the event horizon around a black hole16) a small, highly dense star, with a radius about 10 km, composed almost entirely of tightly packed neutrons
 

 

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