Scientists unveil invisibility cloak big enough to hide a human or a satellite orbiting earth - so long as you look at it from one direction only

Over the last ten years scientists have investigated two main ways of creating invisibility cloaks, according to the MIT Technology Review.

'Transformation optics' involves bending light around an object to make it look as if it wasn't there.
Metamaterials meanwhile are synthetic substances which can also achieve the same aim through using certain optical properties.

Neither technology is perfect, but John Howell, from the University of Rochester, New York, and Benjamin Howell have now shown how to build a device big enough to cloak a person using an array of lenses and mirrors to steer light around a region of space.