The Mars group has been developing the 1.5 metre (5 ft) long B4 hybrid engine for over three years.

BBC: Hybrid success for British rocket

This color image from NASA's Curiosity rover shows part of the wall of Gale Crater, the location on Mars where the rover landed on Aug. 5, 2012 PDT.

FORBES: Wall of Gale Crater

The four international categories also see two nominations for Aloe Blacc as well as nods for Bruno Mars, Beyonce, Rihanna, Foo Fighters and Maroon 5.

BBC: Ed Sheeran leads Brit nominations