A repeating fast radio burst has just given up one of its biggest secrets. Long-term observations revealed a rare signal flare caused by plasma likely ejected from a nearby companion star. This shows ...

Germany's defence minister voiced concern Thursday about a Russian cargo ship firing a signal flare towards a German military helicopter in the Baltic Sea.

Fired from a vast sunspot, the "coronal mass ejection" is expected to reach Earth on either Thursday or Friday this week.

Out of sight, out of mind? Unfortunately for a lot of recreational boaters, that’s the reality when it comes to handheld signal flares. Stored aboard in some dark corner of the boat, most boaters ...