Starship Asterisk*

Hi
Since a few years, I maintain a mirror of APOD's site, adding a few features and translating it in French (https://apod.vidry.ca).
I copy the content from the original site, including links and copyright mentions.
I went over an interesting question: does the copyright allows to share that content on social medias, for example?

I assume creating a mirror site is covered, but what about external sharing?

Thanks