What is the main source of energy in science?

Answer 1

The ultimate source of energy on the Earth comes from the Sun, and gives us coal, oil etc. And of course, our weather and warmth.

The fissile sources of energy such as uranium and plutonium originated in the explosion of a supernova. And may have arrived in the Solar dust cloud via debris of some earlier planet.

Of course, there is some kinetic energy left over from the formation of our Galaxy, Solar system, and Earth, and gives us the movements and rotation of these bodies and systems.