If you happen to be in San Francisco this week and close to the Moscone Center, there’s an article by me in the in-house magazine of the Photonics West conference about the current status of LIGO’s search for gravitational waves. LIGO is due to be switched back on later in 2018, with some modifications to both its laser system and the core mirror optics, but the scope of the project’s technology is so broad that different parts of the exercise have been approached in quite different ways. I asked the people in charge about the overhaul, the external companies who were involved, and what might be next for LIGO.