without matter, there is no energy, no force, nothing. no us, no thought.

matter is made from charged particles.

opposite charged particles attract each other, they collide like magnet and iron ball. the impact force/energy becomes heat/thermal energy of the atoms.

the more atoms get together by gravity attraction, the more mass is added, the higher thermal energy density, the higher temperature.

so bigger star carry more energy, produce stronger light.

the energy is stored in vibrating atoms/charged particles.

the energy a star carry is the vibrating gravity and electrostatic force in its total mass/charges.

the sun's energy is from star formation, the sun is not an active nuclear reactor.

the energy cannot vanish into space but share with other matters surround according to their distance.

the closest star is 4 light years away. we don't even sure if mars has water. forget about those science stories.

all things have a precise mechanism, any theory without it is not correct.

there are only two kinds of charges, same charge repel each other, opposite charge attract each other.

there are only two kinds of forces, attraction and repulsion force.

the whole universe is made from charged particles, there is no other force other than eldectrostatic force.

all things we see, all actions, wind power, solar energy, nuclear power, push a car, all are electrostatic force at work. 

without charge, there is no force. without force, there is no mass. 

charge and mass is like two faces of a coin. 

f=G x m1m2/rr and f=Ke x q1q2/rr may shine a light on you now. 

mass proportional to total charges it carries.