Asteroid

From SGCommand

An Asteroid is a small celestial body composed of rock and metal that can range greatly in size. There is a large asteroid belt in the Solar system between the planets Mars and Jupiter.

In 2002, Anubis sent a naquadah-rich asteroid to Earth, which was large enough to destroy the planet. (SG1: "Fail Safe")

In 2007 when Atlantis was under attack from an Asuran Stargate satellite, Col. Sheppard came up with a plan to use one of the the several asteroids in the Lantean system to temporarily intercept the weapon's beam in order to take the strain off of Atlantis' shield so the city could power up its star drive and leave the planet. (ATL: "First Strike")

When Atlantis was adrift in space after fleeing Lantea, it encountered a small asteroid belt. In order to protect the city, a fleet of puddle Jumpers intercepted and destroyed the asteroids before they could reach and damage the city. Although Dr. Zelenka was still hit in the leg with a micro asteroid while trying to fix some severed power conduits. (ATL: "Adrift")