"I'll give you a clue. Computer!"
"Hi gang!" enthused the computer. "This is getting real sociable isn't it?"
"Shut up," said Zaphod, "and show up the screens."
Light on the bridge sank. Pinpoints of light played across the consoles and reflected in four pairs of eyes that stared up at the external monitor screens.
There was absolutely nothing on them.
"Recognize that?" whispered Zaphod.
Ford frowned.
"Er, no," he said.
"What do you see?"
"Nothing."
"Recognize it?"
"What are you talking about?"
"We're in the Horsehead Nebula. One whole vast dark cloud."
"And I was meant to recognize that from a blank screen?"
"Inside a dark nebula is the only place in the Galaxy you'd see a dark screen."