Good question! When you find a star you write a scientific paper, basically a report about it, and then this gets published (if it is good enough!) in a scientific journal, which is essentially a book (and are all online). If it is not in any paper already (you have to check these!) I know that it is a new one!
Sometimes I did find a few things and thought they were new, and then found out that somebody already found them! It was disappointing. 🙁 But I knew my method must have been right because I found something real, and I persisted and found many never-before seen ones, and that was great! 😀
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