Ailkeid
The planet Ailkeid, which is a name which is still disputed, is a desert planet in a fairly small solar system with five other planets. Ailkeid is about 7.9 times bigger than Earth.
A single day lasts 36.77 hours and a year lasts 269 days. The planet is made up of 14 continents, which make up 50% of the planet's landmass.
3 moons orbit the planet.
It's obvious life on this planet is impossible, but the planet does hold the key to whether or not life will exist on the planets around it.
This planet shields some of the other planets from an asteroid field which crosses every few decades. When this happens, small pieces are scattered through this solar system, but the vast majority are caught by this planet. Those pieces that do get scattered are usually not big enough to destroy the other planets, while at the same time potentially holding the right materials or even lifeforms to begin the process of life on those other planets.