Because if you graph a quad­ratic equation, you get a parabola! For an object with constant vertical acceleration, the following formula describes its height (y) as a function of time (t).

Rapid particle acceleration is possible using a fixed-field alternating-gradient machine—but ‘scaling’ in its design has been necessary to avoid beam blow-up and loss. The demonstration now ...

A presenter-led science video about the relationship between force and acceleration, with Dr Maggie Aderin-Pocock and Dr Alex Lathbridge.

New research suggests that dark energy isn't needed to explain the acceleration in the expansion of the universe — instead suggesting giant voids in space are creating an illusion.