Humanity’s second ambassador to interstellar space has reported back from the frontiers of the solar system — with the message that the border of the sun’s territory is a complex and ever-changing place.

Several new missions aim squarely at a long-standing astronomical conundrum, with the promise of improving space-weather predictions

Crustaceans in the Mariana Trench and other underwater canyons feed on food from the surface laced with carbon-14 from Cold War bomb tests