Blame it on the chemicals sloshing around our heads that creates the impression that we even exist. Of course, compared to the scale of universal time, 70 quick rotations around our local star might qualify as 'not existing'.
Yup, which is why the very first priority should be figuring out a way to increase that number of rotations into at least the hundreds, if not the thousands and beyond!
That's also why I tend to get somewhat testy at times in these threads. I don't like ideas that distract from what should be the prime directive. :)