Saturn's moon Enceladus has four parallel fractures at its south pole, the tiger stripes, that spray water vapour and ice grains from a subsurface ocean into space. A new analysis proposes that waves in that ocean helped carve them. Because the ice shell wobbles as the moon orbits Saturn, a fracture's rough underside can set waves moving; the waves travel down to the seafloor, bounce back and break against the ice, and their energy melts ice from below. The modelling suggests that this melting can open new parallel fractures about 35 kilometres apart, matching the spacing of the real stripes.

Hampi is a UNESCO World Heritage Site in Karnataka, India, with more than 1,600 surviving remains spread over 4,100 hectares. It was the capital of the Vijayanagara Empire from 1336 to 1565. Travellers from Persia and Portugal described it as a prosperous, wealthy and grand city with temples, markets and farms along the Tungabhadra River. By 1500 it was estimated to be the world's second-largest city after Beijing, and probably India's richest at the time. In 1565 a coalition of Muslim sultanates defeated the Vijayanagara Empire, its capital was conquered and destroyed, and the city was left in ruins. Hampi remains a religious centre, with the active Virupaksha Temple at its heart.