Cassegrainian telescope
Newtonian telescope
OAO
OSO
astronomical observatory
astronomical telescope
coelostat
coronagraph
coronograph
heliostat
observatory
orrery
planetarium
radar telescope
radio observatory
radio telescope
reflector
spectrograph
spectroheliograph
spectrohelioscope
spectroscope
telescope
achromatic
all-sky
appearsto
breechloader
demyelination
diskette
eciency
hi-tech
intensifier
panga
sextant
threepenny
actor
compactor
detractor
factor
reactor
tractor