... Tonight's Sky . ... News . Observing . ... Observing springtime deep-sky objects with a large telescope . ... Experiment observes new matter-antimatter difference . ... Now the LHCb experiment has observed a preference for matter over antimatter known as CP violation in the decay of neutral B 0 S particles. ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...