AbstractThe calculation of the molecular column density from molecular spectral (rotational or ro-vibrational) transition measurements is one of the most basic quantities derived from molecular ...

Why do some gases rise in the air while other gases sink? Why do some gases rise in the air while other gases sink? It all has to do with how heavy the molecules are compared to the air itself! Watch ...

Greg Burke in Ottawa asks: "How is it possible in the vastness of space that our sun ever had the density of gasses required to form a star?" At its base, the question is why all the matter didn't ...