" I'd completely forgotten about it. But I saw it now. Spelled out across the lunar surface, two words -- "Hello, Dad!"

I was grinning all over my face. I whispered, "Hello," into the phone. I was assuming that she'd written it for me. Now I come to think about it, maybe she was saying hello to the other dad, the one who'd left.

My dad looked across at me. He looked puzzled. Like he knew it had something to do with me. I said, "Hello, Dad." And he looked even more confused. When he hears this story maybe he'll think I got them to write it there for him. And maybe he'll be right. Maybe it was for both of us, and for other dads too. For all the dads on Earth. And for all the dads not on Earth. And for their dads, outwards in space and backwards in time, all the way to the Dad of the Universe.

And looking out into the space, it sends a greeting from Earth to the Universe. Hello, Dad. "

― Frank Cottrell Boyce , Cosmic