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).
The explosion of the star creates a shock wave that compresses nearby interstellar clouds. Yes. When the material from the explosion encounters an interstellar cloud, it creates a shock wave in the cloud that compresses the cloud very suddenly. This sudden compression can initiate star formation in the cloud.