“A small British company with a dream of building a re-usable space plane has won an important endorsement from the European Space Agency (ESA) after completing key tests on its novel engine technology. Reaction Engines Ltd believes its Sabre engine, which would operate like a jet engine in the atmosphere and a rocket in space, could displace rockets for space access and transform air travel by bringing any destination on Earth to no more than four hours away”. – Chris Wickham via Reuters. Photo: Artist's impression of Skylon. (Photo by Reaction Engines Ltd)

A visitor looks at a sculpture entitled “Couple Under an Umbrella, 2013” by artist Ron Mueck during the press day for his exhibition at the Fondation Cartier pour l'art contemporain in Paris April 15, 2013. (Photo by Charles Platiau/Reuters)

Canadian escape artist Dean Gunnarson attempts to work his way out of a straight jacket while hanging from a crane by a rope which is on fire during a Royal Melbourne Show preview at the Melbourne Showgrounds on September 23, 2011 in Melbourne, Australia. The Royal Melbourne Show officially kicks off tomorrow, and continues until October 4. (Photo by Mark Dadswell/Getty Images)

(L-R) Recording artists Ally Brooke, Normani Hamilton, Dinah-Jane Hansen, Lauren Jauregui and Camila Cabello of Fifth Harmony attend the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

A man wearing a water-filled helmet in which a goldfish swims performs an act titled “Aquaman” during the Night Festival 2016 in Singapore, 20 August 2016. The ninth edition of the festival will run from 19 to 27 August and features installations and performances by a range of international and local artists. (Photo by Wallace Woon/EPA)

Manman Luk, a freelance model and make up artist, poses inside her 100-square-foot (9-square-metre) sub-divided unit, paying a monthly rent of HK4,700 ($606) in Hong Kong, China January 6, 2017. (Photo by Bobby Yip/Reuters)

A doorman stands at the entrance of the “The Walled Off Hotel” in the West Bank city of Bethlehem, Friday, March 3, 2017. The owner of a guest house packed with the elusive artist Banksy's work has opened the doors of his West Bank establishments to media, showcasing its unique “worst view in the world”. The hotel, several of whose rooms look onto an Israeli security watchtower, is awash in the trademark satirical work of the mysterious artist. (Photo by Dusan Vranic/AP Photo)