1. gravity (gravitational pull from the sun brings all the planets into orbit)
2. the big bang.
3. hydrogen gas.
4. planets, moons, asteroids, and comets
5. it’s becomes a black dwarf star
Answer : The freezing point of a solution is 
Explanation : Given,
Molal-freezing-point-depression constant
= 
Mass of urea (solute) = 29.82 g
Mass of solvent = 500 g = 0.500 kg
Molar mass of urea = 60.06 g/mole
Formula used :

where,
= change in freezing point
= freezing point of solution = ?
= freezing point of solvent = 
i = Van't Hoff factor = 1 (for urea non-electrolyte)
= freezing point constant = 
m = molality
Now put all the given values in this formula, we get


Therefore, the freezing point of a solution is 