“The universe is a pretty big place. If it’s just us…” ― Carl Sagan

“If our solar system is not unusual, then there are so many planets in the universe that, for example, they outnumber the sum of all sounds and words ever uttered by every human who has ever lived. To declare that Earth must be the only planet with life in the universe would be inexcusably bigheaded of us.” – Neil deGrasse Tyson