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Hélène Courtois (transl. Nikki Kopelman) MIT Press (2019) On 3 September 2014, Earth got a new ‘cosmic address’. Laniakea (Hawaiian for ‘immense heaven’) is a gargantuan supercluster folding in more than one million galaxies along with our own. This Englishlanguage edition of the award-winning primer by astrophysicist Hélène Courtois, a member of the team that described Laniakea, interweaves cosmographical challenges with backstory (and groundbreakers such as Vera Rubin) and engaging glimpses of Courtois’ own career. She nods, too, to post-Laniakea finds such as the cosmic velocity web. A luminous behind-the-scenes record of a two-decade astrophysical feat.