Key Words

visual binaries
center of mass
astrometric binary
Kepler's laws
Kepler's third law
tilt angle
proper motion
mass-luminosity relation
extrasolar planets
spectroscopic binaries
Doppler effect
redshift
blueshift
double-line spectroscopic binary
single-line spectroscopic binary
velocity curve
eclipsing binaries
light curve
Algol eclipsing binary
accreting binaries
angular momentum
accretion disk
X-ray binary
Roche lobes
inner Lagrange point
nova
supernova, type I
X-ray burster
black hole
open (galactic) cluster
globular cluster
associations
Messier objects
Pleiades cluster
Hyades cluster
Eagle nebula
Orion nebula
turnoff point