Astronomy 1 Crossword
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
                                 
 
 
Down: 1) A region of space-time in which the gravitational field is so strong that nothing, not even light, can escape. 2) The distance over which a wave goes through a complete oscillation; the distance between two consecutive crests or two consecutive troughs.3) A region containing an above-average density of interstellar gas and dust.4) The weakest of nature's fundamental forces but the dominant force over large distances because it is cumulative; all matter and energy contribute, regardless of charge.8) The violent explosion of a star at the end of its life. Hydrogen is present or absent in the spectra of Type II or Type I.9) A phenomenon affecting light as it passes any obstacle, spreading it out.11) A gravitationally bound group of stars that formed from the same nebula.13) The bending of light as it passes from one medium to another having different properties.17) Low-mass, negatively charged fundamental particle that normally "orbits" an atomic nucleus.19) The path followed by the Sun across the celestial sphere in the course of a year.20) A large gravitationally bound system of hundreds of millions stars.21) A self-luminous, gravitationally bound ball of gas that shines because of nuclear reactions in its core. Across: 5) The band of light across the sky coming from the stars and gas in our Galaxy.6) A body that primarily orbits a star, is large enough to be roughly spherical, gravitationally dominates its region of space and has never undergone nuclear fusion.7) A star-like, extremely luminous object billions of light years away.10) The point on the celestial sphere that is directly above the observer.12) The very hot, tenuous, outermost region of the Sun, seen during a total solar eclipse.14) The line between night and day on a moon or planet; the edge of the part that is lighted by the Sun.15) The evolutionary endpoint of stars that have initial mass less than about 8 solar masses. 16) The streak of light in the sky produced when an interplanetary rock enters Earth's atmosphere and burns up as a result of friction.18) One of 88 regions into which the celestial sphere is divided. The pattern of bright stars within it are often named in honor of a god, person, or animal.22) A star approximately at the celestial pole.23) The evolutionary phase following the main sequence of a massive star; the star becomes more luminous and larger. If its size increases by a very large factor, it becomes cool (red).24) The northern or southern lights, caused by energetic particles from the Sun interacting with atoms and molecules in Earth's upper atmosphere, making them glow.25) The northernmost or southernmost point on the celestial sphere that the Sun reaches, or the time of the year when the Sun reaches this point.
 

 

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