Its the year 2050, and extraterrestrials have popped up next to the Solar System. We know they are coming our way and we know they are most likely hostile.
As Steven hawking said:
Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they could reach, If so, it makes sense for them to exploit each new planet for material to build more spaceships so they could move on. Who knows what the limits would be?
Leading strategists determine that war with such an advanced species will without doubt end humanity and perhaps all life on Earth.
Additionally, considering they reached us first, they are so advanced that they will without a doubt win no matter what weaponry we use.
So the global community comes up with a plan that could stop the seemingly given war and make the extraterrestrials change their course by making them fear us (irrationally perhaps).
How could we achieve this?