* Diameter: The Sun's diameter is approximately 1,392,684 kilometers (865,000 miles). That's about 109 times the diameter of Earth!

* Center Temperature: The temperature at the Sun's core is estimated to be around 15 million degrees Celsius (27 million degrees Fahrenheit). This extreme heat is generated by nuclear fusion, where hydrogen atoms fuse together to form helium, releasing tremendous energy.

It's important to note that the Sun's temperature gradually decreases as you move outward from the core. The surface temperature of the Sun, known as the photosphere, is about 5,500 degrees Celsius (9,932 degrees Fahrenheit).