After 10 minutes, the rotating arm would reach the moon's escape velocity of 2.4km per second - about one-sixth of Earth's escape velocity - to put it on the correct trajectory to return to Earth. The ...

Cambridge based Blighter has unveiled its longest-range smart border surveillance radar system which can detect a person 15km or 9.3 miles away with just 4 Watts of power – that’s the same as what is ...