Why the sun is very hot star?

Answer 1

It is based on the cycle of any star.

Prostar is like a small dim star, fusion ignition is the process in which the star grows and gets larger and hotter from the black dwarf into a star (this is the stage the sun is at), then it turns into a red giant where it swells up big time (about 4x is size or more) as the star nears the end of its life, then it turns into a white dwarf with little significance.

Just due to the activity of the particles and the heat they produce, the sun is like any hot star except it is our closest star which makes it seem so big and hot.

All stars are about the size of the sun and radiate the same heat, they are just so far away we dont realise. Some are even bigger than the sun. More research is required!

Answer 2

It is not hot because it is fire ball as some people think. In fact it is a mass of gas and plasma where atomic fission is taking place. Here the nuclei of small elements are joining to make larger ones and in the process releasing enormous amounts of energy.

Answer 3

because it is the inside the sun so it mean is that it will be very hot

Answer 4

sun is definitely not a planet and its not one of the hottest STARS either