'eggshell planets tagged posts

Tread lightly: ‘Eggshell Planets’ Possible around other Star

A false-color radar image mosaic of the Venus lowlands. The brighter, fine peach lines are tectonic structures and the darker, purple areas are relatively smooth volcanic plains. Some small volcanoes appear near the bottom center. This image was made with radar data returned by NASA’s Magellan mission, which operated between 1990 and 1994, and shows an area about 1,400 km (870 miles) across. (Image: NASA)

Strange ‘eggshell planets’ are among the rich variety of exoplanets possible, according to a study from Washington University in St. Louis. These rocky worlds have an ultra-thin outer brittle layer and little to no topography. Such worlds are unlikely to have plate tectonics, raising questions as to their habitability.

Only a small subset of extrasolar planets are likely eggshell...

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