Special puzzles

Our star in extreme ultraviolet: glowing active regions, dark filaments and a grainy chromosphere.

The innermost planet, cratered like the Moon, with the huge Caloris basin.

The surface under the clouds, mapped by radar: highlands, lava plains and Maxwell Montes.

Africa and Europe, with real mountains and glossy oceans.

The near side: the dark maria, Tycho and its rays, in real relief.

Olympus Mons, the Tharsis volcanoes and Valles Marineris.

Cloud bands and the Great Red Spot.

Soft golden cloud bands of the ringed planet.

The calm pale-blue ice giant.

Deep blue, with the Great Dark Spot.

The heart: Sputnik Planitia's nitrogen ice among reddish highlands.

The roof of the world at 8,849 m, with Lhotse, Nuptse and the Khumbu Icefall.

The Colorado River's canyon, cut almost 2 km deep into layered red rock.

The pyramid of the Alps (4,478 m) on the Swiss–Italian border, ringed by glaciers.

Japan's sacred volcano, a near-perfect cone 3,776 m high with its winter snow cap.

Africa's highest mountain (5,895 m): the snowy crater of Kibo and the jagged peak of Mawenzi.

The glacier-carved valley of Half Dome and El Capitan in California's Sierra Nevada.

The deepest lake in the United States, inside a collapsed volcano, with Wizard Island.

A ring of islands around a flooded caldera, left by a huge eruption 3,600 years ago.

The flat-topped mountain between Cape Town and the Atlantic.