Astronomy Ch.15 (Origin of the Solar System) Crossword
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
                                                      
 
 
Down: 2) in planetology, the heat released by infalling matter during the formation of a planetary body3) a disk of dust around some stars found by infrared observations. the dust is debris from collisions among asteroids, comets, and Kuiper belt objects8) 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 9) 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 11) the intense cratering during the first .5 billion years in the history of the solar system 12) one of the undersea mountain ranges that push up from the seafloor in the center of the oceans 13) Jupiter-like planet with a large diameter and low density15) the sequence in which different materials condense from the solar nebula with decreasing temperature outward from the sun16) 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 17) one of the small, icy bodies that orbit the sun and produce tails of gas and dust when they approach the sun19) the separation of planetary material according to density21) 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 nebula27) 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 28) the time required for half of the atoms in a radioactive sample to decay31) a small bit of matter heated by friction to incandescent vapor as it falls through Earth's atmosphere Across: 1) the energy stored in an object as agitation among its atoms and molecules 4) massive object, destined to become a planet, resulting from the coalescence of planetesimals in the solar nebula5) the growth of a particle by addition of material from surrounding gas, atom by atom6) the collection of icy planetesimals believed to orbit in a region from just beyond Neptune out to 100 AU or more7) the puzzle that protoplanetary disks around young stars dont seem to survive long enough to form jovian planets 10) a meteor in space before it enters Earth's atmosphere 14) the density a planet would have if its gravity did not compress it18) a long range of mountains formed by the compression of a planet's crust 20) the sticking together of solid particles to produce a larger particle22) a planet orbiting a star other than the sun23) the theory that the planets formed from the same cloud of gas and dust that formed the sun24) one of the small bodies that formed from the solar nebula and eventually grew into protoplanets 25) a massive and presumably Jovian planet that orbits close to its star and consequently has a high temperature 26) a meteor that survives its passage through the atmosphere and strikes the ground 29) 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 30) the process by which a forming body such as a planet gravitationally captures gas from its surroundings 32) small, rocky world. most asteroids lie between Mars and Jupiter in the asteroid belt 33) explanation for natural processes that depends on dramatic and unlikely events, such as the collision of two stars to produce our solar system34) boundary beyond which water vapor could freeze to form ice35) the release of gases from a planet's interior
 

 

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