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Tree Rings and an Ancient Diary Just Confirmed an 800-Year-Old Solar Storm

A Japanese research team has pinpointed a massive solar storm that struck around 1200–1201 CE. The evidence comes from two sources: a sharp spike in carbon-14 trapped in the rings of a buried tree from northern Japan, and a line in the medieval diary of poet Fujiwara no Teika describing 'a red light in the northern sky.' An 800-year-old convergence — and a warning for today.

Hitchhiking on Planetary Gravity — Why the Slingshot Effect Changed Space Exploration

How can a spacecraft speed up without burning a drop of fuel? Gravity assist — the trick that took Voyager to the edge of the solar system and is now sending NASA's Psyche spacecraft toward a metal asteroid — is one of the cleverest moves in the history of spaceflight. Here's how it actually works.