"Consider an initially axisymmetric, gaseous protoplanetary disk with a uniform surface density. In this disk, a pointlike mass is introduced—an ersatz for a low-mass planet—in a circular, prograde orbit at some distance from the star, such that it orbits in the disk’s midplane. ..." – By Frédéric S. Masset
"White dwarf exoplanetary systems provide windows into composition, physical processes, and minor planets (asteroids, comets, moons, and interior fragments of larger planets) that are unavailable in main-sequence investigations. Almost every known exoplanet orbits a star that will become a white dwarf, and these exoplanets will either survive or be destroyed throughout the stellar transformation. ..." – By Dimitri Veras
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