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39 Cards in this Set

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