Sun

The Sun, also known as Sol, is the star at the center of our Solar System.  It's a G-type main-sequence star (yellow dwarf) approximately 4.6 billion years old. It powers life on Earth through nuclear fusion, converting hydrogen to helium in its core, and accounts for 99.8% of the Solar System's total mass.

Its surface temperature reaches about 9,932°F, while the core is around 27 million°F. The average distance from Earth is 93 million miles, or 1 astronomical unit (AU). Alternate names include Helios (Greek) and Ra (Egyptian mythology).