John Cancalosi / American toad (Bufo americanus) male calling to attract female, New York, USA

Charlie Summers / The Pleiades or Seven Sisters (M45), a star cluster in the constellation Taurus, taken 26 September 2014 from Eastern Colorado. Taken with digital focus stacking.

Juergen Freund / Stars facing north towards constellation Perseus with Perseid meteor shower, above farming fields in the Atherton Tablelands, Far North Queensland. August 14, 2013 4am, composite image.

Oriol Alamany / View of the night sky looking up through trees, with stars and the Milky Way, Mopani, Kruger National Park, Transvaal, South Africa, September.

Jack Dykinga / Eroded rock formation known as the 'Tres Maries', in the Valle de la Luna. One million year old composition of gravel, clay, salt, gems and quartz, against The Milky Way and Southern Cross in the nigh...

Charlie Summers / Stars in the southern hemisphere from the Kalahari Desert. The star in the middle of the rotation is the Southern Poler (Sigma octantis) It is one degree off true south. Southern Africa

Michio Hoshino / Aurora borealis showing the North Star and Big Dipper, Alaska

Martin Dohrn / The Southern Cross star constellation shining above Ballenites trees in Masai Mara, Kenya. Starlight image intensifier camera image taken with no artificial light.

Pascal Tordeux / Timelapse of stars, showing Scorpius, Sagittarius and the planet Mars, with airplanes, Alpes de Haute Provence, France, August.

Claudio Contreras / Boojum tree (Fouquieria columnaris) at night with the Orion Constellation, Sonoran Desert, Valle de los Cirios Biosphere Reserve, Baja California Peninsula, Mexico, March

Yva Momatiuk & John Eastcott / Milky Way over tree, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Milky Way over tree, Namib Desert, Namibia

Yva Momatiuk & John Eastcott / Baobab (Adansonia sp) trees and Milky Way, Kubu Island, Makgadikgadi National Park, Botswana

Yva Momatiuk & John Eastcott / Baobab (Adansonia sp) trees and Milky Way, Kubu Island, Makgadikgadi National Park, Botswana

Yva Momatiuk & John Eastcott / Milky Way above trees, Kruger National Park, South Africa

Charlie Summers / Pleiades or Seven Sisters (Messier 45 aka M45) in Taurus Constellation, taken from Eastern Colorado, USA. 8 November 2015.

Charlie Summers / Comet Lovejoy, C/2014 Q2, going past the constellation Aries. Taken from Colorado, USA. January 22 2015. Focus stacked image.

Charlie Summers / Comet Lovejoy (C/2014 Q2) travelling past the Pleiades / Seven Sisters on its way back into the outer space portion of its orbit. Seen from eastern Colorado, USA, 17th January 2015.

Charlie Summers / Comet C/2013 R1 (Lovejoy) streaming past the star Sarin (HIP 84379) in the Hercules Constellation as it leaves perihelion (its nearest point to the sun) and returns on its orbit to outer space. Taken...

Charlie Summers / Comet C/2013 R1 (Lovejoy) streaming past the star Sarin (HIP 84379) in the Hercules Constellation as it leaves perihelion (its nearest point to the sun) and returns on its orbit to outer space. Taken...

Charlie Summers / Comet C/2013 R1 (Lovejoy) streaming past the star Sarin (HIP 84379) in the Hercules Constellation as it leaves perihelion (its nearest point to the sun) and returns on its orbit to outer space. Taken...

Charlie Summers / Pleiades or Seven Sisters, Messier Object M45, in the Constellation Taurus. Taken on the night of 8th November 2013 from eastern Colorado, USA. Digitally stacked image.

Charlie Summers / The comet C/2012 S1 (ISON) passing through Virgo constellation during twilight on the morning of 18th November 2013. Stacked image.

Charlie Summers / The comet C/2012 S1 (ISON) passing Virgo constellation, during twilight on the morning of 18th November 2013. Digital composite image.

Charlie Summers / The Comet C/2012 S1 (ISON) travelling past the constellation leo, seen from eastern Colorado, 2nd November 2013 from eastern Colorado. The bright star to the left is Sigma Leo.

Charlie Summers / Horsehead and Flame Nebulae seen from east Colorado. Taken with digital focus stacking on October 8-9 2013 from Eastern Colorado.

Charlie Summers / Andromeda galaxy and and sister galaxies M110 above and M32 below. Taken from eastern Colorado, USA, September 6-7 2013. Image taken with digital image stacking.

Charlie Summers / Flame Nebula (NGC 2024) in the Orion Constellation with the Horsehead Nebula to the right. This image was taken on October 7, 2013 from eastern Colorado, USA, with digital focus stacking.

Charlie Summers / Horsehead Nebula in the Constellation Orion, a cloud of dust silhouetted against the red cloud of hydrogen gas. From Eastern Colorado, USA. October 6-7 2013.

Sven Zacek / Northern lights (aurora borealis) over a starry sky with The Plough constellation. Iceland, September 2011.

Christophe Courteau / Fading light over a waterhole on the Okavango Delta in winter, Botswana. Constellation of Orion at centre of the sky

Mark Taylor / Sliding Stone or Moving Rock of Racetrack Playa, taken at night by moonlight, with the stars of the Milky Way in the background, Death Valley, California, USA

Jim Brandenburg / North star in night exposure on Christmas Eve, Minnesota

Neil Lucas / Saguaro cactus (Carnegiea gigantea) at night, with star constellation 'The plough' visible. Sonoran Desert, Arizona, USA, June 2007

Suzi Eszterhas / Chimpanzee (Pan troglodytes) rescued infant named Leo being carried by caretaker Rodney Lemata, Ngamba Island Chimpanzee Sanctuary, Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) rescued infant named Leo, Ngamba Island Chimpanzee Sanctuary, Uganda

Piotr Naskrecki / Orion (Historis orion) butterfly, chrysalis, Costa Rica

Jim Brandenburg / The Big Dipper and aurora borealis over Discovery Lake, Boundary Water Canoe Area Wilderness, Minnesota

Michio Hoshino / Aurora borealis showing the North Star and Big Dipper, Alaska

Tim Fitzharris / Milky Way over buttes, Monument Valley, Arizona

Suzi Eszterhas / Chimpanzee (Pan troglodytes) rescued infant named Leo stripping branch of its leaves, Ngamba Island Chimpanzee Sanctuary, Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) rescued infant named Leo eating, Ngamba Island Chimpanzee Sanctuary, Uganda