Here's why:

* Cells are the basic building blocks of life. They are complex structures that contain DNA and are capable of carrying out life processes like metabolism and reproduction.

* The Sun is a giant ball of hot gas. It is primarily composed of hydrogen and helium, and it generates energy through nuclear fusion. This process is very different from the chemical processes that occur within living cells.

So, while the Sun is an incredibly powerful and essential source of energy for life on Earth, it is not made of the same building blocks as living organisms.