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science chapter 3

section 1,2

constellation a pattern of stars in the sky
visible light electromagnetic radiation that can be seen with the unaided eye
electromagnetic radiation energy that travels through space in the form of waves
wavelength the distance between the crest of one wave and the crest of the next
spectrum the range of wavelengths of electromagnetic waves
refracting telescope a telescope that uses convex lenses to gtaher large amounts of light and focus it on a small area
convex lense a piece of transparent glass curved so that the middle is thicker than the edges
reflecting telescope it uses a mirior instead of a lenses
radio telescope used to protect raio waves from objects in space
observatory a building that contains one or more telescopes
spectrograph breaks the light from an object into colors and photographs
galexy a giant structure that contains hundreds of billions of stars
universe all of space erything in it and ev
light year the els in one year distance that light trv
parallax the apperant change in position of an object when seen from diferent places
giant star a very larege much larger than the sun
apperant magnitude the brightness of a star as seen from earth
absolute magnitude the brightness of a star as is it were a standar distance from the earth
hertz sprung-russel diagram a graph relating to the temperature and the brightness of a star
main sequence the area of the h.s.r.d. that runs from upper left to lower right and includes more than 90% of all stars
Created by: M**M