Sun

• The 'so-called' red hot star 'Sun' isn't really a red star nor a white dwarf star. The color of our star, the sun is white. It is the largest celestial body in our solar system, yet not the largest.

• Due to the just and the particles stuck on the sun, it’s color is seen as orange to us.
  

• It is approximately 696,340 km wide. Sun I unlike a planet but is a star, it is almost a perfect sphere. The sun's core is made up of hydrogen and the energy created by the sun's core is called nuclear fusion.

• The sun is the center of our solar system as all the planets orbit the sun. This was first proved by 'Nicholas Copernicus'.

• The Sun holds 99.8% of the mass of our whole solar system and the rest is taken by Jupiter and Saturn.

Fun Fact- Sun's color is seen blue from the surface of Mars, just because of Mars' atmosphere. Its color is seen differently from every planet.

Source- https://www.esa.int/Science_Exploration/Space_Science/Solar_Orbiter/Solar_Orbiter_s_first_views_of_the_Sun_image_gallery