Why isn the whole universe 28 billion light-years across?
It might help to think of the ants on the balloon here. Imagine two ants on the surface as the balloon blows up. Let’s say they can only send signals to each other at 1 mm per second. Suppose the balloon started inflating 10 seconds ago, but expanded very quickly so that it now has a radius of 1 meter. After 10 seconds ants will only have observed other ants within a circumferential distance of each other which is much smaller than the size of the entire balloon universe.
Related Questions
- If the Universe is only 10 billion years old, why isn the most distant object we can see 5 billion light years away?
- Given that the universe is about 14 billion years old, which of the following statements is logically valid?
- Is the age of the observable universe a homogenious 13.7 billion years throughout?
