Stars crossward

1. this has a big amount of mass and nothing can escape it
3. a large, space-based observatory that orbits Earth, providing a clear view of the universe free from atmospheric distortion
10. cancer the crab is one of these
11. the earth does this to the sun
13. the milkiway is this
15. a giant ball of hot, glowing gas, primarily hydrogen and helium, held together by its own gravity
18. our astronauts go to this home in space
20. long distance in space
21. a region in our solar system, located beyond the orbit of Neptune, that contains a vast number of icy bodies, including dwarf planets like Pluto and many comets
22. our earth is this

2. the most abundant element, forming the majority of the universe's normal matter
4. we are living on this
5. our planet is in this galaxy
6. a triple star system located about 4.3 light-years from Earth
7. both a constellation and a galaxy
8. the tendency of an object to resist changes in its motion
9. the earth is a great amount of this
12. this is what pulls us back to the ground
14. a space probe launched by nasa
15. these have been sent outside of earth and orbit earth
16. a bright star located in the constellation Ursa Minor
17. the time it takes for one complete orbit of the Earth
19. a large, diffuse cloud of dust and gas in space, often the birthplace of stars