Menda

Menda was an Earth-like planet located in Janus GM2797's orbit. Its orbit directly opposed that of Janus Prime. It had a temperate climate, indigenous fruits and vegetables, and clean drinkable water, making it an ideal human colony.

The original inhabitants
The original inhabitants of Menda were very advanced, with great artistic and scientific achievement. They went to war with the Janusians, the inhabitants of Janus Prime. After a long and bloody conflict, the two races overcame their differences and achieved peace.

To ensure that another war never started, they used their advanced technological skills to turn Janus GM2797's solar system into a gigantic bomb. The Eighth Doctor explained this process to Sam Jones: ""It was a terrific feat of planetary engineering. Firstly, they designed two special moons which each had the equivalent of one solar mass. The moons exist in normal space, whereas the masses coexist in hyperspace. By aligning the artificial moons with their sun and linking them via hyperspace, the sun's critical mass would be increased to the point where the nuclear reactions at its centre become unstable and it explodes in a supernova.'""

- -The Eighth Doctor

Another war broke out, but the doomsday weapon was not fully used. The inhabitants of Menda were slaughtered, although they managed to seed Janus Prime with isotope decay bombs.

Human colonization
A few million years later, humanity learned of Menda's existence from Dalek star charts left over from the 22nd century Dalek invasion. (PROSE: The Janus Conjunction)