To the Stars: The Daunting Challenge and Audacious Promise of Interstellar Travel

  Look up at the night sky. Every star is a sun, and many likely host their own families of planets. The dream of visiting these distant worlds—of becoming an interstellar species—is one of humanity’s oldest and boldest ambitions. Yet the sheer, almost incomprehensible scale of space makes this the ultimate engineering challenge. Consider this:…