The SkyShield Missile helps protect your base against meteorites. Each SkyShield Missile Rack increases average meteorite strike time by 30 seconds, so the more SkyShield racks your bases has, the longer it takes (on average) between meteorite strikes.
You will need to build a Kreep Shaft and mine Rare Earths. Research to build the technology to make a Kreep Shaft.
Also build plenty of Lunar Security buildings to aid in your defense against Aliens and Meteorites.
Yield Time: 2d0h (48s)