英文關鍵字
visiters
watching
galaxy
planets
planetarium
line
symbol
equipment
speaker
stars
building
observatory
astronomy
telescope
research
linear
web
site
comet
satellite
sun
people
talk
constellation
astronomer
digital
controlling
hall
antenna
radar
construction
catadioptric
reflector
refractor
icon
motion
graphic
animation
pictogram
hd
animated
item
sign
color