1. 太阳系   meteorite   solar system   satellite   light years   Hint Half-n-half Clue   2. 飞星   meteor   orbit   star   light years   Half-n-half Clue   3. 宇宙   telescope   gravity   universe   planet   Half-n-half Clue   4. 重力   Earth   atmosphere   planet   gravity   Half-n-half Clue   5. 外层空间   astronaut   telescope   outer space   astronomer   Half-n-half Clue   6. 陨石   meteorite   galaxy   orbit   gravity   Half-n-half Clue   7. 小行星   asteroid   star   light years   orbit   Half-n-half Clue