Astronomy Ch.4 (The origin of modern astronomy) Crossword
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
 
 
Down: 1) the classical belief that the perfect heavens could move only by the combination of uniform motion along circular orbits 2) a rule that the strength of an effect (such as gravity) decreases in proportion as the distance squared increases7) a model universe with Earth at the center, such as the Ptolemaic universe8) the initial velocity an object needs to escape from the surface of a celestial body10) the velocity an object needs to stay in orbit around another object13) ocean tide of low amplitude occurring at first-moon and third-quarter moon14) the balance point of a body or system of masses. the point about which a body or system of masses rotates in the absence of external forces15) a measure of the amount of matter making up an object16) either a circular orbit or an elliptical orbit that returns to the same starting point over and over19) the apparent change in position of an object due to a change in the location of the observer. astronomical parallax is measured in seconds of arc Across: 3) ocean tide of high amplitude that occurs at full and new moon4) half of the longest diameter of an ellipse5) a conjecture, subject to further test, that accounts for a set of facts6) a satellite that orbits eastward around Earth with a period of 24 hours and remains above the same spot on Earth's surface8) in the Ptolemaic theory, the point off-center in the deferent from which the center of the epicycle appears to move uniformly9) an orbit that carries an object away, never to return to its starting point11) a closed curve around two points, called the foci, such that the total distance from one focus to the curve and back to the other focus remains constant12) a model of the universe with the sun at the center, such as the Copernican universe17) a theory that is almost universally accepted as true18) the apparent backward (west-ward) motion of planets as seen against the background of stars20) the four largest satellites of jupiter, named after their discoverer, Galileo21) in the Ptolemaic theory, the large circle around Earth along which the center of the epicycle was thought to move22) a commonly accepted set of scientific ideas and assumptions23) a number between 1 and 0 that describes the shape of an ellipse; the distance from one focus to the center o the ellipse divided by the semimajor axis24) a system of assumptions and principles applicable to a wide range of phenomena that has been repeatedly verified 25) the small circle followed by a planet in the Ptolemaic theory. the center of the epicycle follows a larger circle (the deferent) around Earth
 

 

Create your own Crossword Puzzle for Free!		  Show Errors as I Type