600 People

“We step out of our solar system, into the universe, seeking only peace and friendship…” So says the message from the human race on the Voyager spacecraft. But is there, y’know, anyone out there? Alex really wanted to know so he went to speak to an astrophysicist to find out. This is what he learned: Stellar Wobble. Light Clocks. The Mirror Test. The Distance Ladder. And murderous dolphins.