Astronomy Ch.15 (Origin of the Solar System) Crossword
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
                                                        
 
 
Down: 1) brightening of a background star due to focusing of its light by the gravity of a foreground extrasolar planet, allowing the planet to be detected and some of its characteristics measured 2) a small bit of matter heated by friction to incandescent vapor as it falls through Earth's atmosphere3) a disk of dust around some stars found by infrared observations. the dust is debris from collisions among asteroids, comets, and Kuiper belt objects4) the energy stored in an object as agitation among its atoms and molecules 6) the hypothetical process by which a Jovian planet might skip the accretion of a solid core, instead of forming quickly and directly from the gases of the solar nebula8) a planet orbiting a star other than the sun9) the intense cratering during the first .5 billion years in the history of the solar system 11) in planetology, the heat released by infalling matter during the formation of a planetary body14) one of the undersea mountain ranges that push up from the seafloor in the center of the oceans 18) the theory that the planets formed from the same cloud of gas and dust that formed the sun19) the sticking together of solid particles to produce a larger particle21) the puzzle that protoplanetary disks around young stars dont seem to survive long enough to form jovian planets 22) Jupiter-like planet with a large diameter and low density26) a meteor that survives its passage through the atmosphere and strikes the ground 28) small, rocky world. most asteroids lie between Mars and Jupiter in the asteroid belt 29) events in which a small object passes in front of a larger object from an observer's point of view; for example, when an extrasolar planet moving in its orbit passes in front of its parent star, blocking a small amount of the star's light Across: 5) the force exerted on the surface of a body by its absorption of light. small particles floating in the solar system can be blown outward by the pressure of the sunlight 7) the separation of planetary material according to density10) a massive and presumably Jovian planet that orbits close to its star and consequently has a high temperature 12) a meteor in space before it enters Earth's atmosphere 13) one of the small bodies that formed from the solar nebula and eventually grew into protoplanets 15) an object in the kuiper belt, a region beyond Neptune's orbit containing planetesimals remaining from the formation of the solar system. Pluto is one of the largest Kuiper belt objects 16) explanation of natural events that involves gradual changes as opposed to sudden catastrophic changes -- for example, the formation of plants in the gas cloud around the forming sun 17) a long range of mountains formed by the compression of a planet's crust 20) one of the small, icy bodies that orbit the sun and produce tails of gas and dust when they approach the sun23) the collection of icy planetesimals believed to orbit in a region from just beyond Neptune out to 100 AU or more24) the density a planet would have if its gravity did not compress it25) the growth of a particle by addition of material from surrounding gas, atom by atom27) the sequence in which different materials condense from the solar nebula with decreasing temperature outward from the sun30) the process by which a forming body such as a planet gravitationally captures gas from its surroundings 31) the time required for half of the atoms in a radioactive sample to decay32) the release of gases from a planet's interior 33) boundary beyond which water vapor could freeze to form ice34) massive object, destined to become a planet, resulting from the coalescence of planetesimals in the solar nebula35) explanation for natural processes that depends on dramatic and unlikely events, such as the collision of two stars to produce our solar system
 

 

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