Kairos. n. The opportune time. The supreme moment. There's a theory that life on earth originated in some far corner of the universe. That earth wasn't the first place that lighting struck primordial soup. That the first microbes crash-landed here billions of years ago, perfectly preserved on some interstellar rock, flying through the cosmos, hibernating until conditions were just right. The off chance that life originates on earth is so slim—the lottery of lotteries, the million-keystroke Shakespearian play, the rolled back stone and empty tomb—that a more plausible explanation lies elsewhere. Let's let those other planets deal with the odds. All we know is that we've won.
The second kind of stardust is this. It's us.