A story-driven talk about the hidden science of light and the sky, told through two encounters: searching for glow worms, and chasing comets. Starting in the air around us, we travel upwards into the sky and finally in to space. Between these two stories are the bits of science we often walk under without noticing: why the sky changes colour, what darkness reveals, how light behaves, and how small observations can lead to much bigger questions. Part travel story, part natural history, part engineering-minded curiosity, this 30-minute talk is an invitation to look up — and to notice more. It's related to the speaker's new book "Up - A Scientist's Guide to the Magic Above Us' which will be available to purchase on the day (and Lucy will signing books after the event).