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A
air $10
aircraft $20
aliens $10
asteroids $10
astronaut $10
astronomy $20
atmosphere $50
axis $20

B
battle $10
blast $10
boulder $20

C
capsules $10
carbon $20
chaos $10
charon $50
clouds $10
comet $10
computer $10
constellation $50
core $10
country $20
crater $50
crust $10
cylinders $20

D
discs $10
drought $20

E
earthlings $50
earth $10
eclipse $50
eggs $10
environment $50
examination $50

F
fuel $10

G
gas $10
glass $50
gravity $50
greenhouse $50

H
haos $10
hemisphere $20
hunter $10
hurricane $50
hybrid $20

I
ice $10
intercom $20

J
johto $10
jupiter $20

L
light $10
lizards $10
lunar$10

M
microbes $50
mars $10
martian $20
mercury $20
meteorite $20
meteoroid $50
milkyway $20
mission $10
monsters $20
moon $10

N
natural $50
neptune $20

O
observatory $20
oceans $10
orbit $20
oxygen $20

P
particles $20
pilot $10
planet $20
pluto $10
pyrus $20

R
reason $10
reef $20
rock $10
rocket $10

S
satellite $20
saturn $10
saucers $20
science $50
sea $10
security $20
shuttle $10
signal $10
silt $10
sky $20
spheres $10
solar $10
spaceship $50
stars $10
starship $10
swamp $10
sun $10

T
telescope $20
temperature $50
terrain $20
threat $10
tracking $20
tree $10

U
ufo $10
uranus $10
universe $10

V
vehicle $20
ventus $20
venus $10
volcano $20
volume $20
voyage $10

W
water $10
wind $10

Z
zone $10