Lithium, like the majority of chemical elements, can trace its origins back to astrophysical phenomena, but its point of genesis was unclear. Recently, a group of researchers detected enormous quantities of beryllium-7 — an unstable element which decays into lithium — inside nova V5668 Sgr, which suggests that novae are the main source of lithium in the galaxy.
Sprawling across Pluto’s icy landscape is an unusual geological feature that resembles a giant spider. This enhanced colour image, obtained by NASA’s New Horizons spacecraft on 14 July 2015, consists of at least six extensional fractures (arrowed) converging to a point near the centre. Curiously, the spider’s “legs” expose red deposits below Pluto’s surface.