Try to contact the ship that escaped. The one that was being built in silence under false pretenses by people who knew the planet was screwed, but convinced themselves it was better not to cause riots by informing everyone.
Small chance, but the billionaire investors might want to pick me up as a novelty story, or to make themselves feel like heroes
Eh, both permanent space habitation as well as generation ships are so comically far out of our reach that any effort to escape would be doomed. All the billionaires would have accomplished is that they'd die slower. Unless we had decades of advanced warning and even then it would be a stretch. Additionally, in the latter case there's no need to keep it secret. The world is going to end in 50 years just wouldn't cause as much panic.
Secondly, if you look at the picture, the projectile directly pierces the earth. So it would have to be going extremely fast to accomplish this. So chances are we wouldn't see it coming to begin with.
Thirdly, this sort of direct hit implies intelligence. So, chances are whatever wants us dead would then follow through to ensure they get any survivors. Or not, as I pointed out earlier, all survivors are screwed either way.
That's not NASA money. NASA doesn't get any funding. It's all Northrup Grumman and Lockheed Martin that have the reverse engineered anti gravity drive.
The stealth coating tech on the G5 fighters is just what they allowed to leak to the public.