Puzzle 4 - Astronaut

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I J LW JL LGO EK U HMH T YX C ADC NG N OHS WE ZAX BP N ZU O BELLWNGHTIHU TLPSVAEBNSTXK XDXHARA TYAZDJK W YRVMWGFNL H VSRRPU OLPALA RADIANTSZSDEUAYH SOD MFLFLTQIT EZU CTR CEPHEIDMCSTL VJM KEV DELUNATIONIY AER GL IGALACTICNOSAU FI LL WZEQERFCPSCSPQ UI XGA TEZOFSGDPDTDKY BG CFCQR Q KICMTHDEKHTQ KD O LD EEIR R RRNOAP TEDEOITFLFIJ ORNRD RVQXA HAIOV UISEE TLWLM OKCXS IFRP RZGPR NRAX ZWLE SEALE TKOP ZLOX BIRS WCOSG JFEIX SMSV YRDU
1.
celestial
2.
nebula
3.
cepheid
4.
radiant
5.
zenith
6.
pulsar
7.
constellation
8.
zephyr
9.
synodic
10.
heliosphere
11.
explorer
12.
galactic
13.
solarflare
14.
solarwind
15.
lunation
16.
asteroid
17.
geocentric
18.
stellar
19.
explorer
20.
disperse