Space

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