THE followers roar into life, pumping air upwards at 260 kilometres per hour. Decked out in a dishevelled blue jumpsuit, pink helmet and plastic goggles, Claudia de Rham steps ahead right into a glass chamber and… whoosh! Immediately she is suspended in mid-air, a large grin on her face, thrilling to the simulated expertise of free fall.

I had persuaded de Rham, a theoretical physicist at Imperial Faculty London, to return indoor skydiving with me at iFLY London. It appeared becoming, on condition that a lot of her life has been devoted to exploring the boundaries and true nature of gravity – and launching ourselves out of a airplane wasn’t an possibility, no less than on this event.

As she describes in her new ebook, The Beauty of Falling, de Rham skilled to be a pilot after which an astronaut, just for a medical drawback to scupper her possibilities of the final word escape from gravity. However she has gone on to discover this most acquainted and mysterious pressure in a extra profound method, as a theorist, and made an impression by asking a radical query: what does gravity weigh?

By that she means the graviton, the hypothetical particle thought to hold this pressure. If it has mass, as de Rham suspects, that may open a brand new window onto gravity. Amongst different issues, we’d lastly spot a “gravitational rainbow” that may betray the existence of gravitons – and with them, a long-sought quantum description of gravity.

As de Rham floats on air, she makes it look straightforward. She is quickly ascending to…