The Sun is not made of two distinct "parts" in the same way a car has an engine and wheels. It's a giant ball of hot gas, but there are two main regions that are different from each other:

1. The Core: This is the very center of the Sun, where nuclear fusion occurs. It's incredibly hot and dense, and this is where the Sun's energy is produced.

2. The Atmosphere: This is the outermost layer of the Sun, extending far beyond the core. It's much less dense than the core and is divided into several layers: the photosphere (the visible surface), the chromosphere (a reddish layer just above the photosphere), and the corona (a very hot and thin outer layer).

So, while not "parts" in a literal sense, these two regions – the core and the atmosphere – are crucial to understanding the Sun's structure and how it works.