Like all persons of the Library, I have traveled in my youth; I have wandered in search of a book, perhaps the catalogue of catalogues...
According to ESA, the number of galaxies in the observable universe is 2×1012 (two trillion) and as many as 1×1024 stars (more stars than all the grains of sand on planet Earth).
According to Catalogue of Life, there are 2.2 million species on the planet known to taxonomists as of 2019.
Some related inactive projects are All Species Foundation, Tree of Life and The Plant List.
According to Google there are 129,864,880 books (considering all editions separately).
Some related inactive projects are Gitorious and Google Code.
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