What’s a planet anyway? The International Astronomical Union, the group charged with coming up with definitions and names for astronomical objects, has never had a formal definition for “planet.” It’s ...
A proposed planet definition – a planet is a sub-stellar mass body that has never undergone nuclear fusion and that has sufficient self-gravitation to assume a spheroidal shape adequately described by ...
David Rothery is co-leader of the European Space Agency's Mercury Surface and Composition Working Group, and a Co-Investigator on MIXS (Mercury Imaging X-ray Spectrometer) that is now on its way to ...
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