Washington Post

These are the planets you'd want to live on in the star system most like ours

This illustration shows the TRAPPIST-1 star, an ultracool dwarf, and its seven Earth-size planets. Foto: NASA/JPL-Caltech illustration

If you were going to design a laboratory for answering questions about solar systems, you could hardly do better than TRAPPIST-1. The system, just 39 light-years away, comprises a dim red sun orbited by seven rocky, Earth-size worlds - almost as if someone had designed an experiment in planet formation.

When the discovery was announced in February, it sent planetary scientists Amy Barr Mlinar, Vera Dobos and Laszlo Kiss over the moon...

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