Except, from our perspective, that cup is expanding faster than the speed of light. The observable part of the cup we're in is all we will ever know. Even if we invented a spaceship that went the speed of light, we wouldn't be able to fly it to edge of the observable universe, let alone the edge of the cup.
DEEP_SEA_MAX t1_je7j3w5 wrote
Reply to comment by Zeustitandog in 'Ultramassive' black hole discovered by Durham astronomers by [deleted]
Except, from our perspective, that cup is expanding faster than the speed of light. The observable part of the cup we're in is all we will ever know. Even if we invented a spaceship that went the speed of light, we wouldn't be able to fly it to edge of the observable universe, let alone the edge of the cup.