Astronomy Crossword!

5. the planet in the solar system with the closest orbit to the sun
6. the part of the Earth and its atmosphere capable of supporting life
9. A monocular optical instrument possessing magnification for observing distant objects, especially in astronomy
11. a 'natural satellite'
13. A naturally occurring solid object, which is smaller than a planet and is not a comet, that orbits a star
15. The sum of everything that exists in the cosmos, including time and space itself
17. a collection of stars
18. a brand of chocolate bar with caramel and nougat filling
19. Any small luminous dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots.

1. A distinguishable part of a sequence or cycle occurring over time.
2. celestial phenomenon with the appearance given by the orbiting celestial body.
3. The pit left by the explosion of a mine or bomb.
4. the fifth and by far largest planet in the solar system
5. a small fragment of debris in a solar system
7. The absolute height of a location, usually measured from sea level
8. a person who is trained to travel in a spacecraft
10. crescent shape
12. the polar star
14. the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun
16. Any sudden brightening of a previously inconspicuous star.