If we’re supposed to be the only “species” in the universe, then why isn’t the universe smaller? Why would there be all this vast space for no one but us? Earth is the only planet sustainable for us, and what other purpose do the other planets have? While we’re considering colonies on Mars, it will take thousands of years to thrive. And what about the rest? Besides the solar system we have thousands of galaxies and stars, and even planets. So the odds of us being the only species out there is not likely.