What causes interstellar dust and clouds of gas to condense into planets and stars?
a)the law of electromagnetism
b) the law of universal gravitation
c)the law of dust and clouds
d) the law of thermodynamics
i need correct answers not guesses

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat