Puzzle 4 - Astronaut

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Q Q SY LQ QSA RB O YTS A JN T LSY WQ X OOW DY WUS RZ N AE O IDNSQFKUQIMA VVIIYQLZGLTXD ZBZATNI ZAADRBN E NHOFYKDIL J FFPTKD TLAQIR PQOHYIASRNSEYCLC MIO VYCEDAZET TGZ LAB MLTRIVLALSAX IFJ VIL HWYEPLLDENPS SCJ GE UGEHPYIESCOVYX DJ QL QBPLEUSTKFCGIF IN EVC CEETIXLSOLARMR GD GXMOX C GNNOPSMMXKVZ GW F FX OSLA O GRIPOR EDNEJJTHRRFT XITOF AEEPB PSOCG RNRRD LPGEQ DSUEI OELN WBFLO RRGT CITR DESWR CUVE RETI ORCT MXMPC ZUBSE PTMP DKAH
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.
Flare
14.
Wind
15.
lunation
16.
asteroid
17.
geocentric
18.
stellar
19.
explorer
20.
disperse