1. outer planet 2. density 3. orbital distance
4. mass
5. asteroid 6. volume
a. amount of matter in an object
b. irregular rock orbiting between mars and Jupiter
c. gaseous, spherical, cleared its neighborhood
d. amount of space an object takes up
e. distance between any planet and the sun
f. amount of matter in an object, in a given space

1. Outer planets - c. gaseous, spherical, cleared its neighborhood.

2. Density - f. amount of matter in an object, in a given space.

3. Orbital distance - e. Distance between any planet and the sun.

4. Mass - a. Amount of matter in an object.

5. Asteroid - b. Irregular rock orbiting between mars and Jupiter.

6. Volume - d. amount of space an object takes up.

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

the answer to this is proletariats.

hope this : )