Here I say, "And under that wouldn't be rock, but a form of high-pressure ice, like ice IX." 

I used ice IX to refer to the general category of high-pressure ices because it's a familiar term from Kurt Vonnegut's *Cat's Cradle*, but if GJ 1214b, the planet I'm discussing here, is in fact a water world, its most likely form is ice VII (and possibly ice X) due to the planet's predicted interior temperatures. See the upper left of this [water phase diagram](http://ergodic.ugr.es/termo/lecciones/water1.html).

L'astronome Sara Seager nous indique que chaque étoile que nous voyons dans le ciel a au moins une planète en orbite . Mais que savons-nous de ces exoplanètes, et comment pouvons-nous en trouver d'autres ? Sara Seager nous parle de ses exoplanètes préférées, et des nouvelles technologies qui peuvent nous aider à récolter des informations à leur sujet - et même à rechercher des traces de vie sur ces planètes.

A la recherche de planètes au-delà de notre système solaire

Recent discoveries reveal that every star in the night sky hosts at least one planet, and the Milky Way alone teems with billions. Astronomers are now on the brink of identifying planets with conditions similar to Earth. Using innovative tools like the starshade, researchers are developing ways to study distant atmospheres for signs of life. This search may soon answer humanity’s oldest question: are we alone in the universe.

Every Star Hides A Planet—And We’re Close To Finding Life

We ask 5 people creating the future: so, what will it be like?

Planets

astronomy

science

space

solar system

universe

exploration

data

ecology

telescopes

astrobiology

TED Stage Talk

Sara Seager: A la recherche de planètes au-delà de notre système solaire