Nuclear missile

The nuclear missile is a Terran weapon of mass destruction. It must be guided to its destination by a Ghost.

The Nuke in StarCraft I
Nukes are built within a Nuclear Silo, an add-on to the Command Center. Each Nuclear Silo can only hold one Nuke at a time.

When enough resources have been budgeted (including 8 supply), the silo can construct a nuke. Once it is done building, a Ghost can target the missile. When this occurs, the ghost will then be uncontrollable (and "frozen") until the missile is within range. The message "Nuclear Launch Detected" will be displayed to all players and a flashing red dot will be displayed to the point where the Missile will impact. This dot can be hidden underneath a flying unit. Once the missile is "in range" it cannot be diverted, the Ghost is "un-frozen" and within about 10 seconds, the nuke will land and explode.

Underwood, Peter, Bill Roper, Chris Metzen and Jeffrey Vaughn. StarCraft (Manual). Irvine, Calif.: Blizzard Entertainment, 1998.