An athlete does work to lift a heavy ball to the top of a hill. He says, “I did work against a gravitational field to move a heavy ball from one location to another.”
He claims that this situation is an analogy for a concept related to electricity. For
which electrical concept is this an analogy?

35.98  million  mile my friend

Athermometer to measure the temperature of course 

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

Anton because carbon dioxide and water are used with light energy to produce glucose sugar and oxygen gas.