These are the most frequently used words in this book.
100
above
adaptive
aperture
arcsec
area
array
astronomers
astronomical
astronomy
between
billion
built
camera
ccd
data
detail
diameter
dish
distance
distant
earth
energy
equipped
european
even
facility
far
few
field
first
galaxies
giant
high
however
hubble
hundred
image
including
information
infrared
instrument
interferometer
km
la
large
larger
largest
level
light
located
long
million
mirror
mount
must
new
objects
observatory
observing
optical
optics
orbit
planets
pm
point
possible
powerful
project
provide
quasars
radiation
radio
range
research
resolution
second
several
since
site
sky
solar
space
stars
sun
surface
survey
system
telescope
three
time
two
universe
used
visible
wave
wavelengths
work
world
years