The Sun is Star in which a million Earths fit into the Sun
A thermonuclear bomb that size is the Sun when a pound of helium destroys a city in a nuclear bomb
The sun generates massive amounts of electromagnetic and thermal energy from its thermonuclear fusion processes and even more when it flares. These processes also effect gravitational forces and our orbit around the sun. Our orbit is dynamic and we get drift closer and further from the sun varying the amount of heat energy we receive along with increased energy we get from flares.