Eggshell Planets Have a Thin Brittle Crust and No Mountains or Tectonics

Planets without plate tectonics are unlikely to be habitable. But currently, we’ve never seen the surface of an exoplanet to determine if plate tectonics are active. Scientists piece together their likely surface structures from other evidence. Is there a way to determine what exoplanets might be eggshells, and eliminate them as potentially habitable? The authors …

Astronomers See Carbon-Rich Nebulae Where Planets are Forming

Understanding the birth of a planet is a challenging puzzle. We know that planets form inside clouds of gas and dust that surround new stars, known as protoplanetary disks. But grasping exactly how that process works – connecting the dots between a dust cloud and a finished planet – is not easy. An international team …

Protoplanetary Disks Throw Out More Material Than Gets Turned Into Planets

When a young solar system gets going it’s little more than a young star and a rotating disk of debris. Accepted thinking says that the swirling debris is swept up in planet formation. But a new study says that much of the matter in the disk could face a different fate. It may not have …

Rocky Planet Found With Only Half the Mass of Venus

When it comes to finding exoplanets, size matters, but so does weight.  The larger and heavier the planet, the more likely they will be discovered by the current crop of telescopes.  Both the techniques to find exoplanets and the telescopes using those techniques are biased toward larger, heavier planets.  So when even the current crop …