Astronomy Chapter 6 Crossword
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
                                                 
 
 
Down: 2) nebula that absorbs the light it receives and doesn't emit its own; appears darker than its surroundings; made mainly of dust, and molecular H2 and He; also called molecular cloud5) a roughly spherical region around the disk of a galaxy, containing mainly globular clusters6) a group of up to 10,000 stars loosely bound by gravity, found only in the disks of galaxies and often contain young stars8) leftover of a supernova9) point at which the plot of a star cluster leaves the main sequence on an HR diagram; enables us to calculate the age of the cluster11) the remnant of the death of a low-mass star or intermediate-mass star12) a plot of velocity versus radius; plot of orbital speed vs. distance for planets or stars13) "flat" part of a galaxy, where most of the stars are found14) the most luminous examples of active galaxies; radiate energy over a very wide range of wavelengths (indicating they they contain matter with a wide range of temperatures)17) contain active nuclei shooting out vast jets of plasma that emit radio waves coming from electrons moving at near light speed18) central part of a galaxy, much thicker than the disk21) our galaxy, contains 100-400 billion stars, barred spiral galaxy, composed of central bulge, disk and halo, Across: 1) the matter and radiation existing between star systems in a galaxy3) the bending of light rays sent by an object due to the presence of mass on the way; creates a distortion of the object's image4) when the center of a galaxy is unusually bright 7) contain heavier elements, because they were created in interstellar nebulae previously enriched by the star-gas-star cycle and continued to form10) contain lighter elements, are older and are located in the halo, formed then the star formation process stopped15) a concentration of gas and dust in space; main constituent of the interstellar medium16) halo of dark matter surrounding a galaxy; much bigger than the visible halo19) a galaxy in which stars are forming at a rate hundreds of times greater than that in our galaxy; often shine strongest at infrared wavelengths; sometimes have two different galactic centers, which indicates they result from a collision of two gas-rich spiral galaxies20) the process of galactic recycling in which stars expel gas into space, where it mixes with the interstellar medium and eventually forms new stars22) a galaxy whose center emits exceptionally large amounts of energy23) a spherically shaped group of up to 1 million stars strongly bound by gravity, found primarily in the halos of galaxies and contain only very old stars24) a hypothetical substance believed to account for about 20% of the contents of the universe25) a nebula emitting light of various colors after receiving the light of nearby stars; made mainly of ionized atomic H and He; often red because of H electronic transitions (other colors possible)26) a huge collection of stars, stellar remnants, gas, dust and dark matter, bound together by gravity 27) nebula that does not emit radiation of its own, but reflects the light from a nearby star or group of stars; made mainly of dust, which reflects blue better than red, and neutral atomic H and He
 

 

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