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forward normally. But let’s warp this slightly so that it’s space that is flat. It’s all a matter
of perspective, after all: Here, parallel lines are also impossible.
But this time, rather than converging, all parallel lines diverge more and more.
Everything moves further and further apart… Hmm, why does that sound familiar? It is
because that is what the universe is doing.
This is not noticeable within a galaxy, where there is enough mass and gravity to keep
everything together.
However, from what we can see of the universe as a whole, every galaxy is moving away
from
every other galaxy. Scientists try to explain that with dark energy. But maybe all that is
happening is that the universe is just naturally hyperbolic in its
shape? So what would that mean if the universe really was hyperbolic? Well, for starters,
it would mean that the universe was really infinite.
The flat space we looked at was infinite – for each light year you travelled out, you’d
discover another light year’s worth of space.
However, with hyperbolic space, you’d discover more than another light year’s worth of
space. It’s like opening infinite doors, except inside each door are two new ones.
The possibilities would be far more endless, far more infinite, than in just regular flatspace
models. But also, it means that, given enough time, the rest of the universe would drift
away
from us until our galaxy was all that was left… Scientists have looked out across the
universe, however, and have not noticed this hyperbolic
space in action. In fact, things all look pretty flat. So perhaps flat space is the correct
answer.
Yet, this still leaves room to me for hyperbolic space to be the default.
After all, if matter is curving space towards it, and the universe appears flat, it would
make sense that the universe was curved in the inverse, at least to some degree.
Perhaps all three models are true: Perhaps the universe is by default hyperbolic, but