Space around

5. A dwarf galaxy close to the milky way
6. The larger of Mars' moons.
7. The first planet discovered with math
10. A Space Telescope that since it's launch in 1990, has changed our fundamental understanding of the universe.
12. A unit of length used to express astronomical distances
14. These rocks still are in space.
15. The most reflective body in the Solar System?

1. A planet that spins backward and has a day longer than its year
2. A small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance
3. Rocks that enter the atmosphere of Earth or another planet
4. The galaxy cluster that the milky way and the local group is part of
8. A planet that orbits a star outside the solar system
9. Red supergiant star with a diameter 640 times larger than the sun, located in the Orion constallation
11. A very large gasplanet in our solarsystem. Home of the famous red spot
13. Small moonless planet with a very thin atmosphere and a year that is only 88 earth-days