Sapphires and rubies in the sky

Researchers have discovered a new, exotic class of planets outside our solar system. These so-called super-Earths were formed at high temperatures close to their host star and contain high quantities of calcium, aluminium and their oxides -- including sapphire and ruby.

from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2018/12/181219124241.htm