Was anaesthesia used in the Crimean War? Did the Ottoman Empire have tanks in WW1? Was the tortoise formation used in the Gallic Wars? Did William use horses in the Battle of Hastings? Were soldiers in Medieval Era known as the military?
Let’s say they’re passing the orbit of the dwarf planet Pluto, which is 4 light-hours away. Since they’re travelling at 10% the speed of light, we’d have about 40 hours to scramble jet fighters, get those tanks out onto the streets and round up Will Smith, Jeff Goldblum and ...