Yes, it may not happen for a few more decades, but we were the instigators of what might be the most long-distance war in human history:
The new habitability study has involved the collaborating scientists devising two different indexes for rating worlds, in proper scientifiction style*. We now have the Earth Similarity Index (ESI), showing how much like Earth a body is, on which Earth is 1, Mars is 0.7 and our Moon is 0.56.
The scientists have also worked out a Planet Habitability Index (PHI), based on such things as planetary magnetic fields, atmosphere, likely local temperatures etc. Titan, icy natural-gas slush moon of Saturn, scores high on this at 0.64.
But, very worryingly, the planets of the dim, red M-class star Gliese 581 — lying just 20 light-years away in the constellation Libra — score high up the listings in both systems. Under ESI, the exoplanets Gliese 581g, d and c are the next three most habitable known worlds after Earth: and they are also well up under PHI.
Normally this would not be cause for alarm, but — as regular readers of Reg exoplanet coverage will know — should there be intelligent aliens at Gliese 581 they will soon have an intense and well-justified grievance against us.
It was a deliberate and evil provocation we gave, and our fate may already be sealed.