How much is the probability of striking of artificial satellites in space?

Each satellite has an allocated location or orbit and its managers use on-board thrusters to keep it where it should be. When the propellant runs low, they use the last to de-orbit it in a controlled manner (barring problems).

Explanation:

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

conservation of mass

mass before something happens = mass afterwards