729665main_A-BlackHoleArt-pia16695_fullGeekWire’s aerospace and science editor Alan Boyle answers your questions (and you know you have them) about gravitational waves. They were discovered when an alarm went off at an elongated detector in Eastern Washington. But what are they, what do they mean for astrophysics, and was that about black holes? Alan (@b0yle) explains. image: NASA/JPL-Caltech