The bottom of the crater, by contrast, is perpetually dark and, with luck, ice-bound.

ECONOMIST: Spaceflight

Here, skiing and skating are less leisure pursuits than ways of life adapted to the ice-bound landscape.

BBC: The perfect trip: Lapland

Hydrogen was indeed found, but it is still unclear whether it is in the form of ice, or of some other hydrogen-containing compound, such as hydrated minerals that have water bound chemically into their crystal structures.

ECONOMIST: Creative destruction

Around midday Friday, the sturdy and ice-strengthened science research vessel, the "Grigory Mikheev, " will depart Kangerlussuaq in Greenland bound for Disko Bay, a location on the west coast that provides some of the starkest examples of the island's melting ice caps.

CNN: Celebrities embark on climate change voyage