You can use any piece of software that can handle 'fits' files. NASA have a list https://fits.gsfc.nasa.gov/fits_viewer.html DS9 is in this list and is used by many of our students https://sites.google.com/cfa.harvard.edu/saoimageds9 but I don't know if any of these work on a Chromebook. I hope this helps.
You can use any piece of software that can handle 'fits' files.
NASA have a list https://fits.gsfc.nasa.gov/fits_viewer.html DS9 is in this list and is used by many of our students https://sites.google.com/cfa.harvard.edu/saoimageds9 but I don't know if any of these work on a Chromebook.
I hope this helps.