Across
- 3. refers to anything related to the Moon
- 10. surrounds the outer core of the Earth
- 11. is the life that originates outside of Earth
- 12. closest inner planet to the Sun
- 14. is the study of life in the universe, including life on Earth and possibly of extraterrestrial life
- 15. is the third planet from the Sun
Down
- 1. is like a stretched-out circle
- 2. reusable spacecraft that transport people and materials to and from space
- 4. is a vehicle designed to propel itself by ejecting exhaust gas from one end
- 5. closest planets to the Sun
- 6. are objects that orbit the Sun and have a mass larger than the objects near it
- 7. is any small object that orbits a larger object
- 8. was once a planet, but is now a dwarf planet
- 9. Earth's equator divides into two ____
- 13. mixtures of ice and dust