63 Earths Can Fit Inside Uranus - Long Sleeve T-ShirtAstronomy textbooks buried a fully loaded joke in the solar system and just hoped nobody would notice. NASA scientists have to present this fact with a straight face, knowing the entire room relaxed the second they read the slide. The Details: Bold white serif text reads "63 EARTHS CAN FIT INSIDE URANUS" above a teal illustrated planet with tilted rings, surrounded by small white stars and a tiny moon. Smaller white text in parentheses below reads