The question is often posed; what if aliens are real, what if there is extraterrestrial life? Predictable outcome of course; germs, environment, and communication are all doing their part to block a successful meeting with an alien.
What if there isn’t? What if we really are alone in the cosmos?
Earth is great, you know; it’s got water, and um, gravity, a sun and a moon that we call the Sun and the Moon. Yeah, Earth is a wonderful place to call a prison. With so many factors; seen and unseen, how are we ever going to escape the planetary shackles imposed upon the human spices?
Kurzgesagt – In a Nutshell has an excellent video on Why Earth is a Prison ←LINK↓
mrozine has pictures, some of them pretty.