This Space Cloud Smells Like Rum And Tastes Like Raspberries

So there’s a giant cloud hanging out in the Milky Way galaxy that smells a little bit like rum and tastes a little bit like raspberries. Here’s why Sagittarius B2 may be the most delicious cloud in space.

Let’s work our way up the ladder on this one. We’ll start at the bottom step, where things are unimaginably tiny. A carboxyl group is a group of atoms that looks like this: (C(O)OH). A carboxylic acid is any acid that has a carboxyl group. Glue one single extra atom of hydrogen on that group and you have formic acid, the most simple carboxylic acid. In fact, this acid is so basic that ants’ bodies can make it. If you have ever been stung or sprayed with ant venom, you have probably felt the sting of formic acid.

Let’s take another step up the ladder and add booze. Mix ethanol with formic acid and you have ethyl formate, which is an ester. Esters are the most famous of the aroma compounds and are responsible for most of the floral, fruit, and wine smells. A good proportion of esters are simply combinations of carboxylic acids and alcohols. To non-chemists who nevertheless paid attention in chemistry class, esters are known as the “smell molecules.”