Dimethylmercury ((CH3)2Hg) is an organomercury compound. This colorless liquid is one of the strongest known neurotoxins. It is described as having a slightly sweet smell, although inhaling enough vapor to detect its odor would be hazardous.
The formation of a star begins with gravitational instability within a molecular cloud, caused by regions of higher density-often triggered by shock-waves from nearby supernovae (massive stellar explosions), the collision of different molecular clouds, or the collision of galaxies (as in a starburst galaxy).
Gravitational collapse is facilitated by particles moving away from the area of deformed crust. In contrast, convergent collapse occurs when the crust has been previously thinned. The particles move towrd the area of thinning. There is not sufficient evidence to prove the existence of convergent collapse at this time.