Northrop Grumman’s office in Reston, Virginia: the all-cash deal comes as North Korea tests missiles and nuclear weapons, heightening tensions with the US and its allies. Photograph: Paul J Richards/AFP/Getty Images

US defence contractor Northrop Grumman said on Monday it would buy Orbital ATK for about $7.8 billion, getting access to lucrative government contract(...)

Nasa’s Cassini above Saturn’s northern hemisphere prior to making one of its last dives.  Photograph: Nasa/PA

The end of Cassini is here. One of the most ambitious and successful space missions ever undertaken by Nasa, the spacecraft will also be long remember(...)

Waiting to be rescued: Houston has suffered three “500-year floods” in the past three years. Photograph: Adrees Latif/Reuters

Imagine that after the 9/11 attacks the conversation had been limited to the tragedy in Lower Manhattan, the heroism of rescuers and the high heels of(...)

 Nasa astronaut Peggy Whitson after landing in a remote area outside the town of Zhezkazgan, Kazakhstan. Photograph: Sergei Ilnitsky/EPA

Nasa astronaut Peggy Whitson made a parachute landing in Kazakhstan on Saturday, breaking US records with a career-total of 665 days in orbit. Whitso(...)

There’s a great story about a janitor that John F Kennedy ran into at Nasa in 1962. When the president asked him, what he was doing, the man said: “I’m helping put a man on the moon.”

Why do so few people find fulfilment in their work? Surveys confirm that meaning is the top thing millennials say they want from a job, and yet so ma(...)

Silicon Valley housing is priced well beyond the reach of the average worker. Photograph: iStock

The city of East Palo Alto, a wedge of modest houses and light industrial sites in the heart of Silicon Valley, has been passed by in the great tech b(...)

Daybreak at Gale Crater

Mars and Earth share various common traits. Both are terrestrial planets that formed in similar ways. The composition of each is comparable too, up to(...)

The 2017 path of the Great Americian Eclipse which will be seen on August 21st. Source: NASA

Next Monday, August 21st, the shadow of the Moon will bring a two-minute spell of darkness as it sweeps across the United States along a path from Ore(...)

Supporters of opposition leader Raila Odinga protest in Nairobi, Kenya. Riots have been taking place in and around Nairobi since the announcement of Uhuru Kenyatta as president. Photograph: Daniel Irungu/EPA

Kenyan opposition leader Raila Odinga on Sunday called for a strike to support his claim to the presidency and accused the ruling party of “spilling t(...)

Participants at the opening ceremony of the 15th Session of the United Nations Permanent Forum on Indigenous Issues (UNPFII), being held at UN Headquarters in New York, May 2016. UN Photo/Rick Bajornas

Off Baffin Island in Canada, summer sea ice melts to an unprecedented low and Inuit hunters fear stepping on the ice pack. On Kiribati, an island repu(...)