“Astronomy was history. Because space was time. And that was the thing she loved most about the universe itself. When you look at the red star Antares in the southern sky, you are looking over thirty-three hundred trillion miles away. But you are also looking more than five hundred and fifty years into the past. Antares is so far away that its light takes five hundred and fifty years to reach your eye on Earth. Five hundred and fifty light-years away. So when you look out at the sky, the farther you can see, the further back you are looking in time. The space between you and the star is time.”