1. outer space   bouenkyou   juuryoku   uchuukuukan   taiyou   Hint Half-n-half Clue   2. comet   suisei   taiyou   tenbungakusha   eisei   Half-n-half Clue   3. galaxy   taiyoukei   hoshi   gingakei   uchuu   Half-n-half Clue   4. gravity   bouenkyou   juuryoku   chikyuu   tsuki   Half-n-half Clue   5. astronaut   kousei、wakusei   kidou   juuryoku   uchuhikoushi   Half-n-half Clue   6. Earth   uchuu   suisei   chikyuu   taiyoukei   Half-n-half Clue   7. Sun   bouenkyou   taiyou   gingakei   hoshi   Half-n-half Clue