Limestone world gobbled by planet-eating white dwarf
Shower of carbon crumbs points to existence of puzzling exoplanet
![White Cliffs of Dover](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/06/061416_cc_limestone-planet_free.jpg?fit=860%2C460&ssl=1)
An exoplanet torn apart by its dead sun might have been slathered in calcium carbonate, a mineral also found in the White Cliffs of Dover (pictured).
Immanuel Giel/Wikimedia Commons (CC BY-SA 3.0)