Launched in 1990, the NASA/ESA Hubble Space Telescope remains the premier UV and visible light telescope in orbit. With well over 1.6 million observations from 10 different scientific instruments, the ESA Hubble Science Archive is a treasure trove of astronomical data to be exploited.
European Space Agency, Grady comma Carol A., 2016, 'A chemical inventory of Gas and Star-Grazing Exocomets in HD 172555', 1.0, European Space Agency, https://doi.org/10.5270/esa-nh1ip68