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Full moon glowing deep orange-yellow, its darker surface patches visible, in an almost black night sky with a single small light far below. — Rising red full moon Konstantinos Kourtidis

Brightly lit ship deck seen from above at night, with yellow equipment, a cable reel and a tilted crane arm, surrounded by total darkness of the open sea. — North Pacific at night Hannah Mark

Studying shell morphodynamics to improve climate models Jennifer Guarini

White steam and gas rising from many vents across a steep dark slope of loose volcanic rock and ash, under a blue sky. — Mount Etna, Nov. 2015 Neta Wechsler

Dark cave chamber where a lit column of banded orange flowstone and white stalactites glow in the centre, watched by the silhouettes of several people wearing helmets. — A dazzling display of speleothems Ali Raza

Volcano glowing at night, with streams of orange lava running down the cone, glowing fragments shooting up in streaks and a reddish plume drifting left under a starry sky. — Fire on Volcán de Fuego Kieran Wood

Sunset over a city and an estuary, with fiery orange and purple clouds above, beside the black silhouette of a rocky crag on the right. — Sunrise Arthur’s Seat Bruce D Malamud

Line of people wearing headlamps walking in silhouette along a dark ice tunnel, its rippled scalloped walls lit blue-white by a bright opening ahead. — Into the dark 1: exploring englacial conduits in Svalbard Evan Miles

Arc of green northern lights across a star-filled night sky above dark snow-dusted mountains, with a small red light on the ground below. — Norway Northern lights II Giuseppe Murante

Thin crescent moon low in a deep blue twilight sky above silhouetted conifers, with two bright points of light, the planets, higher up to the upper left. — Waxing crescent moon with Venus and Jupiter Thomas Kuhn

Interior of a transparent plastic chamber on a metal frame, crossed by blue, green and violet light beams from lamps and optics, with tubes and cables around it. — HALVIRE - Trapping a volcanic plume Stefan Schmitt

Fiery orange sunset glowing through ragged dark clouds below a black sky, above silhouetted hills and a lone tree. — Sunset Konstantinos Kourtidis

Bright violet lightning bolt with branching forks spreading sideways across a dark night sky, striking down towards a black silhouetted treeline. — Siberian Thunderstorm Mikhail Arshinov

Hand held up so that two fingertips seem to pinch the setting sun as it touches a dark island across a calm bay, above a dry hillside and a cruise ship near the shore. — Measuring the the diameter of the Sun Mioara Mandea

Bright green laser beam shooting straight up into a starry night sky from a white observatory dome, beside a taller domed tower with a ladder, a mast and a rocky slope. — Aerosole lidar at Zugspitze, Germany Stephan Sprinz

View up from the dark floor of a narrow gorge, black rock walls framing a strip of blue sky and white cloud fringed with bright green trees. — Aareschlucht; a darkland Omid Dorostkar

Snow-covered high mountain peaks and a long rock wall glowing pink and orange at the summits in the last light, rising beyond dark silhouetted ridges in the foreground. — Everest and Lhotse at sunset Ann Rowan

Two radio telescope dishes lit red at night, with long-exposure star trails forming concentric circles around a central point in the black sky. — Onsala Twin Telescopes Armin Corbin

Looking out through a huge tall opening in a mountain, its dark rock walls framing a grey sky, with a tiny silhouetted person standing on the snowy, rock-strewn floor. — Isostatic rebound and a hole in a mountain Andreas Kaiser

Polished cross-section of fossil wood on a black background: an oval slice with orange-brown rings and pale spokes radiating like a star from a centre of grey and red banded agate. — Star Dadoxylon, Triassic, Mahajunga, Madagascar Peter Huber

Close-up of a translucent, honey-yellow crystal with ridged, rough faces and yellow staining, held between the fingertips against a dark background. — Gypsum Crystal from the Qattamiya Area, Cairo – An Evaporitic Mineral Growth Ahmed-M- Mohy

Canyon walls of dark red rock topped by pale grey cap rock, with tall stacks and pillars standing out from the cliffs and a dirt track curving along the left rim. — A way on Earth planet Gregoire Darras

Starry night sky above dark stone cottages with lit windows, a silhouetted person standing between the buildings. — Star gazing for artists Ekaterina Smirnova

Green band of northern lights curving across a starry night sky above a low, snow-covered landscape. — Green over white Carme Bosch

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