No matter how bad the writing was, this is not a good thesis supervisor! It’s funny to read the sassy reply, but I’d hate this professor…
Even doctoral students are still students and are there to learn.
A better review would have been something like “There are severe issues with the structure of the text” and then refer to an external resource on technical writing…
Former astronomer here! You can download a lot of data from open access websites such as data.nasa.gov or any of the big digital surveys.
I don’t know about today’s data format, but it used to be all on the FITS format, with lots of libraries in Python/Matlab/etc., and also the excellent SAOImage DS9, all available for free.
Here are some links:
SAOImage DS9: https://sites.google.com/cfa.harvard.edu/saoimageds9/download
https://en.wikipedia.org/wiki/FITS
Space Telescope Science Institute, managing Hubble and JWST data: https://www.stsci.edu/scientific-community/stsci-library-and-institutional-archive/our-collections
Sloan digital sky survey also has a lot of open data: https://www.sdss.org/dr19/data_access/