Learn Spanish (Latin America): El láser habría mostrado la trayectoria de la nave. - The laser would have shown the trajectory of the ship.

Just like in English ('would have shown'), the conditional perfect in Spanish uses two parts. You use the conditional form of the helping verb haber (here, habría for 'it would have') followed by the past participle of the main verb (mostrado from mostrar, meaning 'shown').

Does nave refer to a boat, a spaceship, or a navy?

Nave translates to 'ship' or 'vessel.' While it can mean a water vessel, in modern contexts—especially when talking about lasers and trajectories—it usually refers to a spaceship (nave espacial). Be careful not to confuse it with the English word 'navy,' which translates to la marina or la armada.

Why does the word láser have an accent mark?

Láser is borrowed from English but follows regular Spanish spelling rules. The spoken stress falls on the second-to-last syllable (la), and because the word ends in a consonant that is not n or s (it ends in r), a written accent mark is required to override the default pronunciation rules.

Could I use enseñado instead of mostrado here?

Yes, you could say habría enseñado. Both mostrar and enseñar mean 'to show.' However, enseñar often implies teaching or demonstrating, while mostrar simply means to display or make something physically visible, which perfectly fits a laser revealing a path.