An Alternative Biosphere Thought Experiment

From “Signatures of a Shadow Biosphere” byPaul C.W. Davies, Steven A. Benner, Carol E. Cleland, Charles H. Lineweaver, Christopher P. McKay, and Felisa Wolfe-Simon.
This illustration shows the possible surface of TRAPPIST-1f, one of the newly discovered planets in the TRAPPIST-1 system. Scientists using the Spitzer Space Telescope and ground-based telescopes have discovered that there are seven Earth-size planets in the system. Credits: NASA/JPL-Caltech (from NASA Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star)

As a biologist I had to ask Seager if we should consider 3 habitable planets SO close together as 1 possible ecosystem

Seager: What a wonderful question. Sure there is a student out there who will look at that

This is an amazing question. A planet-spanning ecosystem.

From “Building the ultimate Solar System part 5: putting the pieces together” by Sean Raymond

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