Indeed.
All of this is why I found Hitch Hiker's Guide to the Galaxy so delicious when it came out. Blowing up the earth to make way for a hyperspace bypass. Plans on display at Alpha Centuri for years. Humans can't be arsed to take an interest in local affairs, etc.
That's how we became the...
Precisely.
Proxima B is the nearest habitable planet. Roughly 4 light years away. The fastest we have travelled so far is about 40,000 Kmh. The speed of light is approximately 300,000 kilometres per second, which is 18,000,000 Kmh. Divide that by 40,000 and multiply by 4 and we get 1,800 years...