In this new Hubble image two objects are clearly visible, shining brightly. When they were first discovered in 1979, they were thought to be separate objects — however, astronomers soon realized that these twins are a little too identical!
Extreme weather events fuelled by unusually strong El Ninos, such as the 1983 heatwave that led to the Ash Wednesday bushfires in Australia, are likely to double in number as our planet warms.
NASA's nearly doubled the number of known exoplanets in one fell swoop, with the announcement of 11 new planetary systems hosting 26 planets.
The amount of food the world needs could double by 2050, say scientists, with potentially devastating consequences for the planet.
A Duke University graduate student has found a way to double the battery life of mobile devices with a small alteration to Wifi technology - and it all depends on cooperation.
Stanford researchers have created a new wireless technology that allows signals to be sent and received simultaneously on a single channel. The development could double the speed of existing wireless networks.