Cosmic Journey

Across

1. Journey beyond Earths atmosphere

3. Floating above the ground level

4. Highest point reached in the sky

5. Gleam from distant celestial bodies

8. Celestial body orbiting a star

10. Relating to celestial bodies orbiting a star

11. Vehicle designed for outer space travel

12. Remnants from exploded stars in space

13. Object orbiting a planet or star

Down

2. Clever and astute in judgment

6. Celestial object with a glowing tail

7. All existing matter and space

9. Shortcut through space time continuum