Dust Around Black Holes May Be Smashed PlanetsHigh-speed crashes between asteroids and planets may be responsible for doughnut-shaped dust clouds that veil about 50 percent of known supermassive black holes.SavePrintEpoch Times Staff11/1/2011|Updated: 10/1/2015We had a problem loading this article. Please enable javascript or use a different browser. If the issue persists, please visit our help center.