Studies explain how hot meets cold during comet formation. VIDEO
Astronomers report that they have cleared up a dusty puzzle about the composition of comets.
Infrared spectra of several comets taken two decades ago and an analysis in 2006 of the first cometary material brought back to Earth by spacecraft (SN: 3/25/2006, p. 182) indicated that the frozen bodies contained crystalline silicates, in the form of dust. But these findings present a conundrum because the dust can form