Star: a object made of gas found in outer space that radiates

Energy from their hot center(core) . A star is an iridescent chunk of gas, generally hydrogen and helium, held together by its own gravity. Nuclear combination reactions happening at in its center help the star against gravity and create photons and heat.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.