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).

我们在天空中看到的每一颗恒星都有至少一颗行星在围绕着它运行，天文学家莎拉·西格尔如是说。我们对这些外行星了解多少，又要如何发现更多这样的星球呢？西格尔介绍了她最喜欢的一组外行星，并展示了一项可以帮助我们搜集关于它们的信息——甚至可以帮助我们寻找有生命迹象的外行星的新技术。

莎拉·西格尔: 寻找太阳系外的行星

寻找太阳系外的行星

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TED Stage Talk

寻找太阳系外的行星

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