I mean, it’s not completely unrealistic that some alien race builds a generation ship, points it at Sol 3 because it has a strong magnetosphere, conditions for liquid water and a fairly oxygen rich atmosphere then after their 10,000 year journey they discover a race that’s just beginning to figure out space flight on the planet previously observed to lack any industrial capabilities. Honestly that would make for a good film, and I’m sure there’s science fiction books based on that idea already (Douglas Adams wasn’t far off from that with the Galgafrinchians too, only they arrived about 20,000 years before our present day and supplanted neanderthals as the dominant hominid race on Earth)
The only alien invasion scenario that makes sense is one where the aliens are so advanced they don’t even notice us.
I mean, it’s not completely unrealistic that some alien race builds a generation ship, points it at Sol 3 because it has a strong magnetosphere, conditions for liquid water and a fairly oxygen rich atmosphere then after their 10,000 year journey they discover a race that’s just beginning to figure out space flight on the planet previously observed to lack any industrial capabilities. Honestly that would make for a good film, and I’m sure there’s science fiction books based on that idea already (Douglas Adams wasn’t far off from that with the Galgafrinchians too, only they arrived about 20,000 years before our present day and supplanted neanderthals as the dominant hominid race on Earth)
Kinda like we don’t hesitate to step on grass.