NASA's proposed Early eVolution Explorer mission aims to solve the radius valley mystery
4 Articles
4 Articles
NASA's proposed Early eVolution Explorer mission aims to solve the radius valley mystery
A debate has been raging among planetary scientists for more than a decade—why are there so few exoplanets with a radius of about 1.8 times that of Earth? Exoplanets are currently largely grouped into two distinct categories—"super-Earths" are below that size and have rocky interiors, whereas "sub-Neptunes" are above that size limit and appear puffier. But researchers don't really understand why the path of planetary evolution forces this bifurc…
Something strange happens in the census of worlds beyond the solar system. Astronomers have been scratching their heads for more than a decade before an inexplicable absence: there are hardly any exoplanets with a radius of 1.8 times that of the Earth. It is as if nature had drawn a strip in the cosmic sand and prohibited the planets from standing right on top. NASA now proposes a mission to find out why: it is called Early eVolution Explorer (E…
A debate has been raging among planetologists for more than a decade: why are there so few exoplanets with a radius of about 1.8 times that of the Earth? Exoplanets are currently broadly grouped into two distinct categories: "Super-Terres" are smaller than this limit and have interiors [...]
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