Note the words on the scale. Burl the painter has weight of 600N and carries a weight of 100N of a bucket of paint? What is the weight of the Scaffolding

Efficiency is an act of doing something

It maybe because uranus is made of gas but uranus has a solid core in the middle

This question is incomplete and not physics but i'm  willing to if you can give a better question

Stars are born within the clouds of dust and scattered throughout most galaxies. a familiar example of such as a dust cloud is the orion nebula. turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. as the cloud collapses, the material at the center begins to heat up. known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the milky way are paired or in groups of multiple stars.therefor, i would say the answer is: dust and gases contract.i hope this ! < 3