Everyone knows that spaceships are made of Di-Lithium Crystalloid, and Permalloy Matrix Nitrogenase. So I presume you are being facetious. Cobalt spaceships allow mind warp pentetration and melts when phaser shields transmogrify in worm hole portals.
The planet Zon-Hypazoid of the Beta-Quadrant is Cobalt free. Instead we have Bizzaro Metal known as Tlaboc. Tlaboc is not found with Lekcin or Reppoc. It melts at -100C degs. and Boils at -1000C degs. It is anti-magnetic, soft, does not alloy with Nori and is very common in felsic rocks.
(This is my true statement of fact. Lieutenant Zar, of Zon-Hyapzoid Beta-Probe, Mission 235 to planetoid Earth, Land of the Morons.)
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