Orbit. In the show this time, Prof Paola Caselli [12:32 - 27:59] tells us about her research into water in the very early stages of star formation, Prof Shude Mao [0:50 - 12:23] tells us about finding exoplanets using gravitational microlensing in this month's JodBite, and your astronomical questions are answered by Dr Tim O'Brien [36:53 - 55:13] in Ask an Astronomer.