The competition, which is run by the Royal Observatory Greenwich in association with BBC Sky at Night Magazine, is now in its sixth year and has received over 2,500 entries. Photo: Centre of the Heart Nebula by Ivan Eder (Hungary). Situated 7500 light years away in the “W”-shaped constellation of Cassiopeia, the Heart Nebula is a vast region of glowing gas, energized by a cluster of young stars at its centre. The image depicts the central region, where dust clouds are being eroded and moulded into rugged shapes by the searing cosmic radiation. (Photo by Ivan Eder)

Princess Diana relaxes on the sand during a visit to the beach on the Caribbean Island of Nevis January 4, 1993. (Photo by Mark Cardwell/Reuters)

A Syrian Kurdish ballet dancer performs in an empty market during a lockdown to curb the spread of the Covid-19 coronavirus in Syria's northeastern city of Qamishli on April 7, 2021. (Photo by Delil Souleiman/AFP Photo)

Member of Twycross Zoo, Lily-Jean Morales, seven, visits The Gruffalo Discovery Land, a brand-new four-acre experience at Twycross Zoo, in Leicestershire on April 7, 2022, before it opens to the public on Saturday. (Photo by PA Wire Press Association)

An officer takes a pictures of another officer while controlling the traffic in the Jing'an district of Shanghai on June 1, 2022, after the end of the lockdown that kept the city two months with heavy-handed restrictions. (Photo by Hector Retamal/AFP Photo)

A young bull flees from a Brazilian vaqueiro, or cowboy, competing in the “Pega de Boi” (Ox Catch) tournament in Cabrobo, Pernambuco State, Brazil, on September 4, 2022. The riders compete in pairs to retrieve a cord from a bull which has been released and runs away from them and they are timed on how quickly they can return with the cord. The leather clothing provides them with protection from the dense savannah vegetation which contains a lot of large thorns. Riders have been known to die competing in the tournament (Photo by Carl de Souza/AFP Photo)

Iranian chess player Sara Khadem competes, without wearing a hijab, in FIDE World Rapid and Blitz Chess Championships in Almaty, Kazakhstan December 26, 2022, in this picture obtained by Reuters on December 27, 2022. (Photo by Lennart Ootes/FIDE/via Reuters)

A young macaque perches on a pole, observing nearby tourists while eating some seeds in Jigokudani Yaen-koen wild macaque monkey park on February 16, 2015 in Yamanouchi, Nagano, Japan. (Photo by Manuel Romaris/Getty Images)