Embargoed to 1900 Friday May 27  European Space Agency handout image of Comet 67P/Churyumov-Gerasimenko, taken by the Rosetta orbiter in August 2015 when the object was at its closest point to the sun. Rosetta found evidence of basic building blocks of life in gases surrounding the comet. PRESS ASSOCIATION Photo. Issue date: Friday May 27, 2016. See PA story SCIENCE Rosetta. Photo credit should read: ESA/Rosetta/Navcam/PA Wire  NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption. Reuse of the picture may require further permission from the copyright holder.

ESA/Rosetta/Navcam/PA

Comet 67P Churyumov Gerasimenko, taken by the Rosetta orbiter when the object was at its closest point to the sun. Rosetta found evidence of basic building blocks of life in gases surrounding the comet

Kyrgyz men on horseback compete during their traditional game of "Oodarysh" during the celebrations of the 90th anniversary formation of the Chui region in the village of Kuntu some 20 kms from Bishkek on May 27, 2016. / AFP PHOTO / VYACHESLAV OSELEDKOVYACHESLAV OSELEDKO/AFP/Getty Images

Vyacheslav Oseledko/AFP/Getty

Kyrgyz men on horseback compete during their traditional game of “Oodarysh” during the celebrations of the 90th anniversary formation of the Chui region in the village of Kuntu, Kyrgyzstan

Mercedes' Lewis Hamilton at the Circuit de Monaco, Monaco. PRESS ASSOCIATION Photo. Picture date: Friday May 27, 2016. See PA story AUTO Monaco. Photo credit should read: David Davies/PA Wire. RESTRICTIONS: Editorial use only. Commercial use with prior consent from teams. Call +44 (0)1158 447447 for further information.

David Davies/PA

Mercedes’ Lewis Hamilton greets fans at the Circuit de Monaco, Monaco

ANNAPOLIS, MD - MAY 27: The U.S. Navy Blue Angels fly over graduation ceremonies at the U.S. Naval Academy May 27, 2016 in Annapolis, Maryland.  U.S. Secretary of Defense Ashton Carter is the commencement speaker for this year's graduating class.  (Photo by Mark Wilson/Getty Images)

Mark Wilson/Getty

The U.S. Navy Blue Angels fly over graduation ceremonies at the U.S. Naval Academy May in Annapolis, Maryland. U.S. Secretary of Defense Ashton Carter is the commencement speaker for this year’s graduating class

A small boy holds up a cardboard cover over his head to protect himself from the sun as he walks on the dried up bed of river Tawi in Jammu, India, Friday, May 27, 2016. Temperatures across much of northern and western India have hovered around 40 degrees Celsius (104 degrees Fahrenheit) for weeks causing much distress, specially amongst the farming communities. (AP Photo/Channi Anand)

Channi Anand/AP

A small boy holds up a cardboard cover over his head to protect himself from the sun as he walks on the dried up bed of river Tawi in Jammu, India

EU referendum ...Labour Party leader Jeremy Corbyn (left), Labour chief whip Rosie Winterton and Ed Miliband visit Vulcan Renewables, a biogas renewable energy recycling plant near Doncaster, as the pair go into battle against Brexit together. PRESS ASSOCIATION Photo. Picture date: Friday May 27, 2016. See PA story POLITICS EU Miliband. Photo credit should read: Stefan Rousseau/PA Wire

Stefan Rousseau/PA

Labour Party leader Jeremy Corbyn (left), Labour chief whip Rosie Winterton and Ed Miliband visit Vulcan Renewables, a biogas renewable energy recycling plant near Doncaster, as the pair go into battle against Brexit together

An image of an indigenous Australian man is projected onto the sails of the Sydney Opera House during the opening night of the annual Vivid Sydney light festival in Sydney, Australia, May 27, 2016. REUTERS/Jason Reed      TPX IMAGES OF THE DAY

Jason Reed/Reuters

An image of an indigenous Australian man is projected onto the sails of the Sydney Opera House during the opening night of the annual Vivid Sydney light festival in Sydney, Australia

Revellers dace as they take part in the Patum in the Catalan village of Berga, Spain Friday, May 27, 2016. The Patum of Berga is a popular festival whose origin can be traced to medieval festivities that is celebrated each year in the Catalan city of Berga during Corpus Christi. It consists of a series of dances by townspeople dressed as mystical and symbolical figures accompanied by the rhythm of a drum. One of the protagonist of La Patum is the fire, and the climax of the festival is the Salt de Plens (Fire Demons), who set the square on fire with hundreds of firecrackers burning at the same time. (AP Photo/Emilio Morenatti)

Emilio Morenatti/AP

Revellers dace as they take part in the Patum in the Catalan village of Berga, Spain. The Patum of Berga is a popular festival whose origin can be traced to medieval festivities that is celebrated each year in the Catalan city of Berga during Corpus Christi 

TOPSHOT - Men stand next to a fire as wo...TOPSHOT - Men stand next to a fire as workers on strike block the access to an oil depot near the Total refinery of Donges, western france, early in the morning on May 27, 2016 to protest against the government's planned labour law reforms.

Jean-Sebastien Evrar/AFP

Men stand next to a fire as workers on strike block the access to an oil depot near the Total refinery of Donges, western france 

U.S. President Barack Obama (R) puts his arm around Japanese Prime Minister Shinzo Abe after they laid wreaths in front of a cenotaph at Hiroshima Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Carlos Barria

Carlos Barria/Reuters

U.S. President Barack Obama puts his arm around Japanese Prime Minister Shinzo Abe after they laid wreaths in front of a cenotaph at Hiroshima Peace Memorial Park in Hiroshima, Japan 

Displaced Somalis queue for aid in Beledweyne, north of Mogadishu on May 26, 2016. Hundreds of families have been forced out of their homes following flash floods in Beledweyne after torrential rains pounded the area in the last few days.The heavy rains led to the bursting of River Shabelle which caused massive floods in residential areas along the river.  / AFP PHOTO / MOHAMED ABDIWAHABMOHAMED ABDIWAHAB/AFP/Getty Images

Mohamed Abdiwahab/AFP

Displaced Somalis queue for aid in Beledweyne, north of Mogadishu. Hundreds of families have been forced out of their homes following flash floods in Beledweyne after torrential rains pounded the area

Actors wait on the beach before filming a scene for the film, "Dunkirk," in Dunkirk, northern France, Thursday, May 26, 2016. The film, directed by Christopher Nolan, tells the story of the Dunkirk evacuation, which took place during World War II. (AP Photo/Michel Spingler)

Michel Spingler/AP

Actors wait on the beach before filming a scene for the film, “Dunkirk,” in Dunkirk, northern France. The film, directed by Christopher Nolan, tells the story of the Dunkirk evacuation, which took place during World War II 

Citizens walk on the Corniche, or waterfront promenade along the Beirut coastline, Lebanon, Thursday, May 26, 2016. (AP Photo/Hassan Ammar)

Hassan Ammar/AP

Citizens walk on the Corniche, or waterfront promenade along the Beirut coastline, Lebanon

Lightning from a severe storm fills the sky behind a grain elevator in Belvue, Kan., Wednesday, May 25, 2016. The storm produced tornadoes near Chapman, Kan. (AP Photo/Orlin Wagner)

Orlin Wagner/AP

Lightning from a severe storm fills the sky behind a grain elevator in Belvue, Kansas

TOPSHOT - Iraqi pro-government forces fire an anti-tank cannon near al-Sejar village, north-east of Fallujah, on May 25, 2016, as they take part in a major assault to retake the city from the Islamic State (IS) group. Iraqi forces, consisting of special forces, soldiers, police, paramilitary-fighters and pro-government tribesmen, launched a major assault to retake Fallujah, the scene of deadly battles during the US occupation and one of the toughest targets yet in Baghdad's war on the Islamic State group. / AFP PHOTO / AHMAD AL-RUBAYEAHMAD AL-RUBAYE/AFP/Getty Images

Ahmad Al-Rubaye/AFP/Getty

Iraqi pro-government forces fire an anti-tank cannon near al-Sejar village, north-east of Fallujah as they take part in a major assault to retake the city from the Islamic State group 

Eikei Suzuki (L-R), governor of the Mie Prefecture, European Council President Donald Tusk, Italian Prime Minister Matteo Renzi, German Chancellor Angela Merkel, U.S. President Barack Obama, and Japanese Prime Minister Shinzo Abe, participate in a tree planting ceremony as they visit the Ise Jingu shrine in Ise, Mie Prefecture, Japan May 26, 2016, as part of the G-7 Summit. REUTERS/Carolyn Kaster/Pool

Carolyn Kaster/Pool/Reuters

Eikei Suzuki (L-R), governor of the Mie Prefecture, European Council President Donald Tusk, Italian Prime Minister Matteo Renzi, German Chancellor Angela Merkel, U.S. President Barack Obama, and Japanese Prime Minister Shinzo Abe, participate in a tree planting ceremony as they visit the Ise Jingu shrine in Ise, Japan apart of the G-7 Summit. 

TOPSHOT - US First Lady Michelle Obama cheers during the White House Turnaround Arts Talent Show at the White House May 25, 2016 in Washington, DC.  Students from throughout the US performed at the presidential mansion showcasing the power of arts education.  / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

Brendan Smialowski/AFP/Getty

US First Lady Michelle Obama cheers during the White House Turnaround Arts Talent Show at the White House in Washington D.C. Students from throughout the US performed at the presidential mansion showcasing the power of arts education 

TOPSHOT - Giraffes wander about at the African Reserve (Réserve Africaine ) of Sigean, southern France on May 24, 2016.    / AFP PHOTO / RAYMOND ROIGRAYMOND ROIG/AFP/Getty Images

Raymond Roid/AFP/Getty

Giraffes wander about at the African Reserve (Réserve Africaine) Sigean, southern France

Britain's Prince Charles, Prince of Wales (L) and his wife Britain's Camilla, Duchess of Cornwall prepare to try produce inside McGettigans Butchers store in Donegal, north-west Ireland, on May 25, 2016. / AFP PHOTO / PAUL FAITHPAUL FAITH/AFP/Getty Images

Paul Faith/AFP/Getty

Britain’s Prince Charles, Prince of Wales and his wife Camilla, Duchess of Cornwall try produce inside McGettigans Butchers store in Donegal, north-west Ireland

House of Representatives and Senate tribunal staff prepare the tally board during the presidential and vice-presidential canvassing of votes at the session hall of House of Representatives in Manila on May 25, 2016.  Incoming Philippine president Rodrigo Duterte has launched a series of obscenity-filled attacks on the Catholic Church, branding local bishops corrupt "sons of whores" who are to be blamed for the nation's fast-growing population. / AFP PHOTO / NOEL CELISNOEL CELIS/AFP/Getty Images

Noel Celis/AFP/Getty

House of Representatives and Senate tribunal staff prepare the tally board during the presidential and vice-presidential canvassing of votes at the session hall of House of Representatives in Manila