Astronomy Chapter 3 Crossword
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
 
 
Down: 1) the difference between the apparent magnitude (m) and the absolute magnitude (M) of a star, from which we can deduce the distance to the star2) Nine principal categories of stars determined by their absorption spectra3) a pair of stars that appear close to each other in the sky as seen from Earth4) a continuous array of all the rainbow colors5) all the other energy levels 7) a pattern of dark lines across a continuous spectrum8) two stars appearing to be close as seen from Earth, but which are far away and not gravitationally bound9) binary star for which one of the two stars is invisible, but affecting the motion of the other star in a way that can be measured10) binary star for which one star passes in front of the other11) the distance to an imaginary star whose parallax is 1 second of arc. About 31 trillion km (19 trillion miles)/3.26 light years12) a star's speed toward or away from us along a line of sight 13) A broadened line can yield a lower limit to the star's rate of rotation on its axis16) Temperature sequence beginning with hottest stars (O) and continuing to the coolest (T) stars. OBAFGAKMLT17) the energy required to remove an electron from an atom19) the actual amount of light emitted by a star into space21) a measure of how bright a star appears to us (also called visual brightness)22) the different energies an electron is allowed to have23) roughly 90% of stars on the HR diagram lie here, in a band from the top left to the bottom right26) branch of astronomy that involves measurements of distances and motions of stars27) a splitting or broadening of spectral lines occurs in the presence of a magnetic field29) the analysis of spectra (or spectrums)30) lower left corner of HR diagram, end life cycle of a star34) the smallest particle of a chemical element Across: 6) a measure of how luminous a star actually is (equal to the apparent magnitude the star would be if it were 10 pc away)14) the apparent change in a star's position when viewed from opposite sides of the earth orbit15) a type of mathematical law in which one quantity is inversely proportional to the square of another quantity18) motion of stars through space with respect to the Sun, determined by both radial velocity and proper motion20) Peak wavelength is inversely proportional to its temperature in Kelvin. (The hotter the star, the the shorter the wavelength at which it emits its maximum radiation.)24) half the apparent change in the star's angular position25) A broadened spectral line is produced when atoms collide more frequently in higher-density stars28) the amount of light at a distance d from a star (depends on the distance)31) atomic model that describes electrons as orbiting the nucleus in concentric circular orbits. To each orbit corresponds a specific energy for the electron. When an electron jumps to a lower level, it emits energy in the form of light with a value equal to the energy difference between the two levels. 32) the amount of angular change in a star's position per year33) binary star for which the two stars can be resolved with a telescope35) binary star for which the two stars are too close to each other to be resolved (we can detect that they revolve around each other with a varying Doppler shift in their spectrum)36) the lowest energy level available for an electron37) two stars revolving around a common center of gravity, bound by gravity38) a pattern of bright-colored lines of different wavelengths
 

 

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