ELLIE: Hello and welcome to the BBC Bitesize Physics ... its mass in kilograms by the strength of the gravitational field in Newtons per kilogram. JAMES: Right, let's try out some examples then.

a discovery recognized by the Nobel Prize in Physics in 2015. The underlying mechanism that makes these transformations possible, physicists realized, meant that neutrinos must have some mass.

Despite ample experimental hints to the contrary, the Standard Model predicts that neutrinos shouldn't have any mass at all.

But gravity only becomes noticeable when you have at least one very big mass (a planet for example). No, the distance is squared in the equation so it would have nine times the force (a third of ...