The core inside 0.20 of the solar radius contains 34% of the Sun's mass, but only 3.4% of the Sun's volume. Inside the 0.24 solar radius is the core which generates 99% of the fusion power of the Sun.
https://en.wikipedia.org/wiki/Solar_core
The core inside 0.20 of the solar radius contains 34% of the Sun's mass, but only 3.4% of the Sun's volume. Inside the 0.24 solar radius is the core which generates 99% of the fusion power of the Sun.
https://en.wikipedia.org/wiki/Solar_core