Deflector

An object created from various materials that is used to protect a planet from space. This is the usually used in places where the nearest star casts off too much heat or radiation, or for places frequently peppered by local asteroid belts. It can also be the final line of defense from intelligent enemies.

The object works best if created from the material of the planet.

Though referenced often, they are rarely seen on-screen. The most well known is the Hofran Gem. This was lost by the crew to the Amalgamation, and never recovered. A second gem was crafted to replace it.