Sunspot region 4114 has unleashed its most powerful solar flare yet — an X1.9 class that erupted late June 19, triggering shortwave radio blackouts across the Pacific Ocean, including parts of Hawaii.

Despite an earlier announcement that Radio Martí was back on the air following a presidential executive order that suddenly halted the U.S.-funded radio broadcasting to Cuba, its signal is probably ...

A recent SETI Institute study suggests that space weather could blur and weaken extraterrestrial radio signals long before ...