1. The sun is a star. It is a massive ball of glowing gases that produce their own heat and light. The sun is the center of our solar system, and it makes up over 99% of the mass in the system.

2. The sun is very hot. The surface temperature of the sun is about 9,940 degrees Fahrenheit (5,505 degrees Celsius). The core of the sun is even hotter, reaching temperatures of about 27 million degrees Fahrenheit (15 million degrees Celsius).

3. The sun is very large. The sun is about 4.6 billion years old. It is about 109 times larger than the Earth, and it has a mass about 330,000 times that of the Earth.