> four engines is $582.7 million, or $146 million per engine. This means that a single engine on NASA's rocket costs roughly the same amount that the space agen

> four engines is $582.7 million, or $146 million per engine. This means that a single engine on NASA's rocket costs roughly the same amount that the space agency paid for an entire mission on the Falcon Heavy rocket—$178 million for the Europa Clipper spacecraft.