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Cathodoluminescence micrograph of calcite: glowing orange and dark red zoned crystals with triangular and zigzag growth bands, like a pattern of stars. — Starlight calcite Marcello Natalicchio

Tall slender tree stretching up through a narrow gap between towering orange rock walls towards a strip of blue sky, the sun glowing behind its trunk. — Stretching to the light Valeria Volpe

Smooth, curving walls of a narrow sandstone slot canyon glowing orange, red and violet, with fine wavy layering and a deep black shadow on the right. — Through rocks, water, and time Daniele Penna

Volcano erupting at night: glowing lava fountains and showers of sparks burst from a cone, with orange lava streams running down its flank under red-lit clouds. — Etna eruption: 28 November 2013 Marco Neri

Blurred person in a red jacket on a ship deck in the foreground, looking out over dark blue water to snowy mountains under orange sunset light and dark storm clouds. — Sunset over the Beagle Channel - leaving Ushuaia Carsten W. Mueller

Close-up of spiky bright yellow sulphur crystals like fine needles, with a clear water drop clinging to their tips, against a blurred dark reddish-brown background. — Condensation drop on sulphur Ulrich Kueppers

Pale shaft of light filled with drifting dust falling vertically through a narrow canyon of smooth, curving dark red sandstone walls. — Antelope Canyon Ioannis Daglis

Very narrow gap between glowing orange-red sandstone walls dotted with small knobbly bumps, curving in and out as the passage winds away. — Spooky Gulch Joern Behrens

Fissure eruption at night: a long thin line of glowing lava along the horizon below huge clouds of smoke lit bright red, with a dark hill silhouetted in front. — Earth breathing fire Maryse Schmidt

Slope of bright red volcanic sand and gravel scattered with dark grey angular boulders, fading into thick white mist towards the top. — Glimpse of a foreign planet Julia Miloczki

Upward view through a narrow slot canyon of smooth, wave-like sandstone walls glowing red, orange and pink, framing a patch of blue sky with white clouds. — Color contrast at Upper Antelope Canyon Aude Lavayssière

Close-up of a desert rose: thin, blade-like gypsum crystals in shades of orange and brown, stacked and overlapping like petals, glinting in the light. — Close-up of a desert rose Katja Laute

Glowing orange lava lake at the bottom of a deep volcanic crater at dusk, sending up a plume of reddish lit fumes past the layered crater walls. — Karthala volcano eruption Shafik Bafakih

A colourful profile in Seropédica (Brazil). Alba Catalán Merlos

View down into a cylindrical furnace glowing red and orange, with a bright yellow glowing crucible at its centre hanging from a thin wire. — Peridotite melt spreading light in the oven Thomas P. Ferrand

Tall orange and cream rock spires and hoodoos rising above a winding dirt trail with small figures of hikers, a few green pine trees and a deep blue sky. — Queen's Garden Wim van den Berg

Glowing orange and yellow Sun just above the horizon, flattened and with ragged edges, with the small dark round disc of Venus near its top and a thin dark cloud band across its lower part. — Transit of Venus over the Sun Eliza Teodorescu

Crater floor at night covered in rough lava, glowing in red light with many bright incandescent spots, and a small group of people standing near the lava below a steep crater wall. — Fournaise Stéphanie Barde-Cabusson

Two people in orange overalls and white hard hats handling ropes on a ship deck above a grey sea, beside an orange ocean bottom seismometer with a metal frame and handle. — One day at sea as a seismologist Raffaele Bonadio

Person in yellow protective clothing and a welding mask welding a metal rail on a ship, showering sparks, beneath a large red crane arm marked Triplex. — RV SONNE in the dockyard Marie Heidenreich

Looking along a tight slot canyon with smooth, flowing orange sandstone walls on both sides, a soft sandy floor and a bright sliver of light from above. — Spooky Gulch Joern Behrens

Rows of crescent-shaped spots of sunlight from a partially eclipsed sun cast on a grey wall inside a wooden shelf, above a red journal reading Optics Communications. — Suns eclipsed in a lab library Claudine Vanbauce

Group of orange rock hoodoos in bright sunlight, one with a small balanced cap on a thin neck, framed by a shadowed rock wall at right with more hoodoos and pines in the valley behind. — How long will they withstand nature? Wim van den Berg

Close-up of a sandstone surface with wavy, curving bands of deep red, purple and pale lilac, some layers sweeping in tight arcs. — Sandstone Shai Oron

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