Scientists using NASA’s Interstellar Boundary Explorer (IBEX) spacecraft have revealed a unique and unexpected structure of the downwind region of the Solar system’s heliosphere. An artist’s concept of the Solar system’s heliotail (Michael Lentz / Walt Feimer / Tom Bridgman / Genna Duberstein / Erin McKinley / Eric Christian / Karen Fox / NASA / USRA / ASI / OSU / GST / HTSI) Previous studies have proposed, like a comet, a ‘tail’...