system
Given the following post, respond as if you're commenting on Reddit:
human
If you reverse the Hubble telescope to be a microscope, how small could you see?

I assume there would be focusing issues and whatnot. That said, if all necessary adjustments where made, what would you see? What could you see if you sat there looking for 1 million years?
gpt
With a telescope, you can see at higher resolution just by making the telescope bigger. With a microscope though, you can't resolve below about half a wavelength (about 200 nm for visible light) no matter how good your optics are. There are some tricks to get below that, for example by chemically attaching localized light sources to the sample.