A Asteroid
B Black hole
C Comet
D Direct motion
E Eclipse
F Flares
G Galaxy
H Hubble constant
I Ionosphere
K Kirk Wood gaps
L Local group
M Magnetosphere
N Neutron star
O Oblate spheroid
P Parallax
Q Quasar
R Radiant
S Synodic period
T Terminator
U Umbra
V Variable star
Z Zenith
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