Discovery team leader Diana Dragomir told MIT News: “We think this planet wouldn’t be as gaseous as Neptune or Uranus, which are mostly hydrogen and really puffy.
“The planet probably has an atmosphere composed of heavy molecules, such as water.
“We know a lot about atmospheres of hot planets, but because it’s very hard to find small planets that orbit farther from their stars, and are therefore cooler, we haven’t been able to learn much about these smaller, cooler planets.
“But here we were lucky, and caught this one, and can now study it in more detail.”
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