It's impossible to give an exact number for how many people built the Hubble Telescope. Think of it this way:

* Thousands of individuals contributed to the project in various ways: engineers, scientists, technicians, managers, and even support staff.

* Many companies played a role in designing and manufacturing different components.

* The project spanned decades, with generations of people involved.

Instead of a single number, we can say that thousands upon thousands of people across numerous disciplines and organizations worked together to bring the Hubble Telescope to life. It's a testament to the power of collaborative human ingenuity.