1. _____ of lunar dust were brought home to Earth by astronauts on several space expeditions.

2. The space shuttle is very _____ but functional.

3. The Solar System is located in the Milky Way _____ .

4. The gravitational _____ of a star is also called the death of a star.

5. _____ have lately been debating the existence of certain stars.

6. We are hopeful that no large meteors will _____ near the earth.