I am aware of Astrophotography on a limited/thats a thing basis and would like to give it a go someday. That said, I think its pretty self-explanatory that you will need some kind of imaging capturing device as a first step to even have interest in this project. The documentation is on the home page... :https://nighttime-imaging.eu/docs/master/site/requirements/

Not to be too snide, but I highly doubt you'll need a waterproof bag if you are trying to take images of Space at night... Kinda hard to see through clouds.