Dadjoke Memes

The ultimate dad joke of astrophysics! The background image is the famous Hubble Deep Field—containing thousands of galaxies billions of light-years away—with "This meme is universal" plastered across it. It's simultaneously the most literal and figurative pun in cosmology. The meme itself exists throughout the observable universe (which is roughly 93 billion light-years in diameter), and the joke works on a universal scale. Somewhere, a theoretical physicist is quietly chuckling while calculating the probability this meme violates the cosmic speed limit.

The perfect planetary pun doesn't exi-- oh wait, it does! This meme cleverly plays on the fact that Earth's rotation is literally what creates our day-night cycle. One complete 24-hour rotation equals one day, so the Earth's rotation literally makes our day. It's that rare breed of dad joke that would make both astronomers and English teachers simultaneously groan and nod in approval. The cosmic wordplay is strong with this one!