... Bad Astronomy . ... Mad Science . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Bubbles as in the bubbles found in soda, soft drinks, all flow upwards,when shaken .Is it possible that it would ever flow downwards? ... They "know" which way down is because that is the way gravity pulls them, and they tend to flow away from that direction. ... It is the acceleration of gravity that the bubbles feel, and they flow in the other direction. ... 2008 Phil Plait. ...