>>>Good job they're here - we'd have a bugger of a time finding them otherwise.

I am with you on that. If Einstein's is the last word on interstellar travel, it will be a very lonely universe for humanity.

He was a real spoil sport for dreamers. It would take on the order of 80,000 years to get to the nearest star at the escape velocity of our solar system. Numbers like that would make exploring a challenge.