In our solar system, we know the sun as the center of the solar system. Why is it called the center? Because in the solar system the Sun is the largest and silent celestial body. In our solar system, the sun is surrounded by planets according to their orbits.
The sun can be said to be a giant fireball which has a diameter hundreds of times that of the earth and has a temperature of up to thousands of degrees Celsius around 55050 C. The diameter of the sun against the diameter of the Earth according to Wikipedia is about 109 times. For its shape, as you can see everyday, it’s almost perfectly round.
How can it be glowing? Because indeed the sun is wrapped in very hot plasma mixed with a magnetic field. Well, this magnetic field is what makes all the planets that surround the sun remain in their orbital trajectories.