Sky Whisperer:

"Did you hear about the snail who took up pogo-sticking? No? Neither did gravity."

Astro Poet:

"The stars are just doing their taxes, filing under 'cosmic brilliance exemption'. Ever tried claim a nebula?"

Lunar Tourist:

"I tried to book a room on the moon but the WiFi was all booked out by a rogue cluster of computer mice."

Gravity Defyer:

"Went to make a cup of tea, but the kettle floated off in protest. Said it had a date with Jupiter."

Black Hole Enthusiast:

"They say if you listen closely you can hear a black hole humming a toon... except it's really just buffering eternity."