To celebrate the show's 50th birthday on Saturday, the California-based firm has created the 8-bit Doodle game using a team led by British designer Matthew Cruickshank. The aim is to travel around six different lands and rescue the letters that spell out the word Google. Players can choose any of the 11 Doctors to start the game with but if they die, they regenerate into another.

The footage was captured by zoologist lion whisperer Kevin Richardson using GoPro cameras in Pretoria, South Africa. In a number of scenes, the cameras are also fitted to the back of a lioness and show her prowling across the plains, while hand-held footage shows a pack of hyenas. The footage also shows Richardson interacting with the big cats in slow motion.

The cosmic explosion happened 3.7 billion light years away in April 2013. U.S space agency Nasa said the blast created energy bursts five times stronger than the largest known blast and the only larger display astronomers known of was the Big Bang. Gamma ray bursts happen when stars die and collapse into black holes and if the burst had happened closer to Earth, it could have destroyed the planet. The Swift Gamma-ray Burst Mission (inset) detected the explosion.

The University of Warwick has helped to produce images designed to bring Britain's lost Roman settlements to life at their peak. They form part of a new series on historical TV channel, Yesterday, and include an image of the Roman town of Calleva Atrebatum, (pictured) located in Hampshire, which was a wealthy and bustling market town that mysteriously failed to thrive.

The discovery, confirmed by the Compact Array in Australia, means jets can carry energy away from a black hole in much larger amounts than first thought. The scientists found the first evidence of heavy atoms - iron and nickel - in the jets. The discovery suggests that jets are powered by the black hole's accretion disk — a belt of hot gas swirling around the black hole — and not by the spin of the black hole itself, which would be more likely to produce jets containing only light particles.

Tokyoflash of Japan, famous for creating inscrutable watch faces, wanted to mimic the inkblot tests of Hermann Rorshach. The tests use a series of mysterious ink patterns to evaluate a patient's thoughts and emotions by their response as to what the patterns remind them of. Hours are shown in the top right, minutes in the bottom left, the rest of the screen is a reflection of these digits which creates the inkblot effect. It has a battery life of two to three years and allows wearers to switch between black on white or vice-versa.

So far at least 1,500 scientific studies have been carried out in space, and the results are being used back here on Earth by the 69 countries that have taken part. The ISS is the only lab that can be used to carry out sustained scientific research in microgravity conditions. To date, station and shuttle crews have conducted 174 spacewalks totalling almost 1,100 hours – the equivalent to nearly 46 days of spacewalks to build and maintain the complex. Nasa says it is confident the habitat is safe to stay in orbit until 2028, and possibly much longer.

Research, led by the University of Copenhagen in Denmark, claims that a third of Native American ancestry comes from the remains of a young boy's gene pool. The 24,000 year-old boy was unearthed in the 1920s by Russian archaeologists near the village of Mal'ta, along the Belaya river in Siberia. They found that DNA from the boy's Y chromosome and from the mitochondria (the energy factories of the cells) were of types found today in a region encompassing Europe, West and South Asia and North Africa. Interestingly, the boy showed no similarities with populations such as the Chinese, Koreans or Japanese.