The master builder maneuvered his spaceship into the correct position and began applying force to the moon. His young assistant looked puzzled.
“What are you doing now?”
“I’m putting this moon in just the right place so that if intelligent life does start up on that planet we’ve just seeded it will show them an eclipse against their sun.”
“Why go to all that trouble?”
The master builder smiled. “So they know I was here. Such a thing would never happen by chance would it. I like to think of it as my little motif; the signature of a craftsman.”
Author’s note: Having total solar eclipses by chance on the one planet where we know life exists does seem a bit of a long shot!