A new study has found that the seven planets orbiting the nearby ultra-cool dwarf star TRAPPIST-1 are all made mostly of rock, and some could potentially hold more water than Earth. The planets' densities, now known much more precisely than before, suggest that some of them could have up to 5 percent of their mass in the form of water — about 250 times more than Earth's oceans.
This ESOcast takes a quick look at this important result.
Editing: Nico Bartmann.
Web and technical support: Mathias André and Raquel Yumi Shida.
Written by: Nicole Shearer and Richard Hook.
Music: Music written and performed by: Colin Rayment & Stan Dart.
Footage and photos: ESO, L. Calçada, spaceengine.org, M. Kornmesser.
Directed by: Nico Bartmann.
Executive producer: Lars Lindberg Christensen.
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