Table of Contents

Volume 542 Number 7642 pp392-512

23 February 2017

About the cover

Michaël Gillon et al. report the results of a photometric monitoring campaign of the star TRAPPIST-1 from the ground and space. They reveal that at least seven planets with sizes and masses similar to Earth revolve around this Jupiter-sized star. These planets all have equilibrium temperatures low enough to make it possible for liquid water to exist on their surfaces. The cover shows an artist’s interpretation of the seven planets and their relationship with TRAPPIST-1. Cover art: NASA/JPL-Caltech/Robert Hurt (IPAC).

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