Wikipedia notes:
Early European astronomers such as Tycho Brahe identified new stars in the night sky (later termed novae), suggesting that the heavens were not immutable.
Who were the other European astronomers who identified new stars around the time of Tycho Brahe?
Wikipedia contributors. (2019, May 23). Star. In Wikipedia, The Free Encyclopedia. Retrieved 18:38, June 3, 2019, from https://en.wikipedia.org/w/index.php?title=Star&oldid=898392700