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39 Cards in this Set
- Front
- Back
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visible light
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light you see with eyes
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electromagnetic radiation
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energy that can travel through space directly in a form of waves
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wavelength
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distance between the crest of one wave and the crest of the next wave
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spectrum
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range of different wavelengths
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colors that form spectrum of visible light
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red orange yellow green blue violet
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electromagnetic spectrum
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range of electromagnetic waves placed in a certain order
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wavelengths included in electormagnetic spectrum
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radio waves infrared waves visible light ultraviolet radiation xrays gamma rays
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what telescopes collect and focus
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different types of electormagnetic radiation
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convex lens
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piece of transparent glass, curved so middle is thicker than edges
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refracting relescope
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uses convex lenses to gather a large amount of light and focus it oto a small area
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reflecting telescope
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uses mirror and radiowaves
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radio telescope
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devies used to detect radio waves from objects in space
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type of Galileo's telescope
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refracting
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largest visible telescopes are all
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reflecting
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observatory
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building that contains one or more telescopes
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why have astronomes built the largest visible light telescopes on the tops of mountains?
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sky on some mountaintops is clearer and not brigtened by city lights
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spectrograph
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breaks light from object into colors and photographs the resulting spectrum
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two kinds of info from stars
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chemical compostitions
temperatures |
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how astronomers infer which elements are found in a star
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comparing a star's specturm with the known spectrums of different elements
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stars at different temperatures produce different
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line spectrums
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how astronomers infer how how a star is
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by comparing a star's spectrum witht he known spectrums of elements at different temperatures
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galaxy
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cluster of stars, gases, dust held together by gravity
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universe
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space and everything in contains
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astronomical unit
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average distance form EArth to sun
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light-yaer
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distance light travels in one year
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parallax
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apparent change in position of an object when you look at it from different views
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three main characteristics used to classify stars
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size
temperature brightness |
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how bright a star looks from earth depends on what two factors
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apparent magnitude
absolute magnitude |
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what two things must an astronomer find out in order to calculate a star's absolute magnitude
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apparent magnitude
standard distance |
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pulsar
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neutron star that gives off pulses of radio waves
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how a star is born
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contractin gas and dust become so hot that nuclear fusion starts
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white dwarf
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[
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black dwarf
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[
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supernova
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[
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neutron star
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[
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black hole
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[
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star systems
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groups of two or more stars
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binary stars
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star systems with two stars
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eclipsing binary
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star system in which one star blocks light from another
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