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Mark H
"GJ1214b is also near enough (13 parsecs, or about 40 light years) that Berta’s follow-up studies on its atmosphere using the Hubble Space Telescope’s WFC3 instrument have proven fruitful. [...] Earlier work on GJ1214b’s atmosphere had been unable to distinguish between water in the atmosphere and a worldwide haze, but the new work takes us a good way farther and into the planet’s internal structure." - Mark H from Bookmarklet
"If you examine the density of this planet (known because we have good data on its mass and size), you get about 2 grams per cubic centimeter, a figure that suggests GJ1214b has much more water than the Earth and a good deal less rock (Earth’s average density is 5.5 g/cm3). We can deduce a fascinating internal structure, one in which, as Berta says, “The high temperatures and high pressures would form exotic materials like ‘hot ice’ or ‘superfluid water’ – substances that are completely alien to our everyday experience.”" - Mark H