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"Astronomy"

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Words
altitude
artificial satellite
asteroid belt
asteroids
black hole
comet
constellations
eclipse
globular cluster
h-r diagram
horizon
john glenn
light-year
main sequence
meteor
meteorite
meteoroid
neil armstrong
neutron star
parallax
phases
pulsar
quasars
red giant
satellites
supernova
white dwarf
yuri gagarin
zenith