Scientists may have finally seen the sun telegraph an eruption hours before it happened — and the one caught was one of our star's most powerful explosions. Drawing on a rare dataset collected in the hours leading up to a massive solar flare, scientists identified a series of changes in the sun's atmosphere that offer new clues about how major eruptions begin. Eventually, these results could help improve space weather forecasting. "I was not expecting what I found," Louis Seyfritz, a...