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Astronomy 30-1 Word Scramble

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Term	Definition
star	a large celestial body that is composed of gas and that emits light
Doppler effect	an observed change in the frequency of a wave when the source or observer is moving
light-year	the distance that light travels in one year
parallax	an apparent shift in the position of an object when viewed from different locations
apparent magnitude	the brightness of a star as seen from the Earth
absolute magnitude	the brightness that a star would have at a distance of 32.6 light-years from Earth
dark-line spectra	another name for absorption spectra
absorption spectra	spectra composed of individual lines at specific frequencies characteristic of the gas
emmission spectra	a spectrum consisting of a series of bright lines against a dark background
continuous spectra	spectrum formed from white light contains all colors, or frequencies
bright-line spectra	another name for emmission spectra
Sol	the Latin name of our sun
hydrogen	most-common element in stars
helium	second most-common element in stars
apparent motion of stars	motion visible to the unaided eye, caused by the movement of Earth
circumpolar stars	stars that are always visible in the night sky
red-shift	wavelength distortion caused by a star moving AWAY from Earth
blue-shift	wavelength distortion caused by a star moving TOWARD Earth
spectrograph	instrument used to separate light into its different colors or wavelengths
absorption spectra	the kind of spectra produced by stars when observed by astronomers
O-blue	class and color of hottest stars
M-red	class and color of coolest stars
OBAFGKM	the spectral classes, in order from hottest to coolest
G-yellow	official class and color of the sun
circumpolar motion	type of motion where stars appear to revolve around the North Star
circumpolar, constellation shift, parallax	What are the three apparant types of stellar motion?
rotation, revolution (binary), and toward/away from Earth	What are the three actual motions of stars?
parallax	Scientists use this apparent motion to calculate the distance of stars that are within 1,000 light-years from Earth
emmission spectra	the type of spectra we observed in the light-tubes lab
the gasses the star is made of	What does a star's spectrum tell us about the star?