[holoduke]

It's like a balloon. Take two distances when balloon is empty. Let's say furthest points of each other (10cm) and halfway points (5cm) When you inflate the balloon the distance of furthest points increased to 20cm. But the 5cm is 8cm and not 10cm. The same in space. the further you go the faster it expands. The event horizon is the point where the expansion is faster than the speed of light. Any photon emitted will never reach us. The crazy thing is that according to some theories even the space between atoms will be beyond the event horizon.