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).
If the Jeans length of a cloud is smaller than the scale of a cloud, the gravitational force is stronger than the gas pressure, and the cloud shrinks. As a cloud of mass M shrinks, its scale R decreases, its density increases as M/R3, and its Jeans length changes proportionally as Mââ1/2T1/2R3/2.