Microscopes are used to magnify extremely small objects, like cells or microorganisms. Telescopes are used to magnify distant objects, like stars.

While both are optical instruments, they are designed for completely different purposes. So, no one has ever used a microscope to observe stars.

It's possible that you're thinking about the invention of the telescope. Galileo Galilei is often credited with being the first to use a telescope to observe the heavens.