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In page Andromeda Galaxy:

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In 1864, William Huggins noted that the spectrum of Andromeda differed from that of a gaseous nebula.[14] The spectrum of Andromeda displays a continuum of frequencies, superimposed with dark absorption lines that help identify the chemical composition of an object. Andromeda's spectrum is very similar to the spectra of individual stars, and from this, it was deduced that Andromeda has a stellar nature. In 1885, a supernova (known as S Andromedae) was seen in Andromeda, the only one ever observed in that galaxy.[15] At the time, it was called "Nova 1885"[16]—the difference between "novae" in the modern sense and supernovae was not yet known. Andromeda was considered to be a nearby object, and it was not realized that the "nova" was much brighter than ordinary novae.[citation needed]