Astronomy Ch.14 (Modern Cosmology) Crossword
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
 
 
Down: 1) the energy believed to fill empty space and drive the acceleration of the expanding universe2) in cosmology, the circumstance that the primordial background radiation seems much more isotropic that can be explained by the standard big bang theory3) mass in the universe, as yet undetected except for its gravitational influence, which is made up of slow-moving particles 4) extremely large structural features in the universe, regions tens of hundreds of megaparsecs in size, containing few or no visible galaxies5) the postulated energy that fills empty space and drives the acceleration of the universe6) theories that attempt to unify (describe in a similar way) the electromagnetic, weak, and strong forces of nature7) the distribution of clusters and super-clusters of galaxies in filaments and walls enclosing voids 10) the property of being approximately the same from location to location; observed to be true for the universe 12) the assumption that any observer in any galaxy sees the same general features of the universe 15) the high-density, high-temperature state from which the expanding universe of galaxies began20) the end state of a white dwarf that has cooled to low temperature 24) an astronomer of physicist whose research focuses on the overall properties of the universe and its origin 26) the study of the nature, origin, and evolution of the universe 27) the fate of the universe if dark energy increases with time and galaxies, stars, and even atoms are eventually ripped apart by the accelerating expansion of the universe 28) the property of appearing approximately the same in all directions as viewed from one location; observed to be true for the universe 31) a linear region containing many galaxies and galaxy clusters, part of the large-scale structure of the universe Across: 3) a model universe in which the average density is great enough to stop the expansion and make the universe contract 8) a version of the big bang theory, derived from grand unified theories, that includes a rapid expansion when the universe was very young9) Weakly Interacting Massive Particles, possible component of dark matter, consisting of one or more hypothetical types of subatomic particles that have mass, thus exerting gravitational force, but otherwise interact weakly, or not at all, with ordinary matter 11) a model of the universe in which the average density is less than the critical density needed to halt the expansion 13) the stage in the early history of the universe when ultraviolet photons from the first stars ionized the gas filling space14) the conflict between observation and theory about why the night sky should or should not be dark16) the part of the universe that you can see from your location in space and in time17) proposed dark matter made up of particles other than protons and neutrons (baryons)18) radiation from the hot clouds of the big bang explosion. the large red shift makes it appear to come from a body whose temperature is only 2.7 K19) one divided by the hubble constant. the hubble time is the age of the universe if it has expanded since the big bang at a constant rate 21) dark matter made up of particles, such as neutrinos, traveling at or nearly at the speed of light22) the average density of the universe needed to make its curvature flat 23) the stage in the early history of the universe within 300,000 years of the big bang when the gas became transparent to radiation25) a cluster of galaxy clusters 29) a model of the universe in which space-time is not curved 30) matter composed of antiparticles, which upon colliding with a matching particle of normal matter annihilate and convert the mass of both particles into energy. the antiproton of the antiparticle of the proton and the positron is the antiparticle of the electron 32) the period of time after the glow of the big bang faded into the infrared and before the birth of the first stars, during which the universe expanded in darkness33) a constant in Einstein's equations of space and time that represents a force of repulsion 34) unchanging, not evolving; for example, a static universe, which would have the same overall properties as a function of time, and not be expanding or contracting 35) in cosmology, the peculiar circumstance that the early universe must have contained almost exactly the right amount of matter the make space-time flat 36) the observed property of the universe that the average distance between galaxies is increasing with time
 

 

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