How are image credits expressed in Astronomy presentations? Sorry if this is a stupid question. I'm preparing an astronomy presentation, and I want to make sure I give credits where credits are due. But I see credits appear in different formats, for example:

ESA/Hubble &amp; NASA, V. Antoniou; Acknowledgment: Judy Schmidt - a slash and an ampersand
ESA/Hubble &amp; NASA, B. Nisini - a slash and an ampersand
NASA, ESA, and R. Humphreys (University of Minnesota), and J. Olmsted (STScI) - commas
ESA/Hubble &amp; NASA, L. Stanghellini - commas and ampersand

If possible, I want all of the credits in my presentation to have the same format. So essentially, my question is: do a comma and a slash mean different things in image credits? Or can I write everything using the same format, e.g. for the four photos above:

ESA / Hubble / NASA / V. Antoniou / Judy Schmidt
ESA / Hubble / NASA / B. Nisini
NASA / ESA / R. Humphreys (University of Minnesota) / J. Olmsted (STScI)
ESA / Hubble / NASA / L. Stanghellini
There is no conventional format, really. For publications purposes if one uses data from a telescope or image or code created by someone else or similar, the source usually requests being cited or acknowledged in a form specific to their own taste. Some examples include what you quoted or “This paper makes use of the following ALMA data: ADS/JAO.ALMA#******. ALMA is a partnership of ... “.
Answering your question.

For ESA and NASA there is probably a difference between “/“ and “&amp;”.
For a publication in a journal you must follow the exact wording.
If you just give a presentation no one minds if you use your favorite formatting while acknowledging all parties involved.