IS THIS it? There were rumours this week that gravitational waves may have been detected. There is a rumour that gravitational waves have been detected… but the data is still being analysed Gravitational waves are theoretical ripples in space-time produced by massive bodies accelerating through space. They were predicted as part of Einstein’s general relativity but have yet to be detected directly. The Laser Interferometer Gravitational-Wave Observatory (LIGO) searched for signals from 2002 to 2010, with no luck. Its more sensitive successor, Advanced LIGO, started collecting data on 18 September 2015. Barely a week later, Lawrence Krauss at Arizona State University tweeted a rumour that the detector had picked up a signal. And on 11 January, Krauss claimed that the signal had been confirmed by an independent source. “Gravitational waves may have been discovered!! Exciting,” he tweeted. Off Twitter, he was more cautious. The signal could be a false one injected into the data as a test. “I’m told it isn’t that,” Krauss told New Scientist. The LIGO team says it is still analysing the data. This article appeared in print under the headline “Gravity waves?