Across
- 3. The third planet from the Sun
- 6. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
- 7. all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy
Down
- 1. Flying mammal
- 2. Large marsupial
- 4. of or from outside the Earth or its atmosphere
- 5. Humans Are The Real Aliens
- 7. any perceived aerial phenomenon that cannot be immediately identified or explained