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).
How the interstellar wind is focused by the sun's gravitational field (click for Flash movie). Our sun is moving through the local interstellar gas cloud approximately into the direction of Scorpio with a speed of about 25 km/sec. As a result of this motion, an interstellar wind with that speed is blowing through our planetary system.