# If the universe is infinite, shouldn’t I already have been contacted by a time and space travelling doppelgänger?

## What does it mean if the universe is infinite?

It means space never ends. It’s a matrix of limitless galaxies, stars, planets, and energy. California Institute of Technology theoretical physicist Sean Carroll cautiously noted last spring that while a finite universe would be provable, scientists can never prove infinity.

## How do we know the universe is infinite?

An infinite universe could have a geometry that is totally flat like a piece of paper. Such a universe would go on forever and include every possibility — including endless versions of ourselves. On the other hand, a donut-shaped universe would have to be finite, as it’s closed.

## How can the universe expand if its infinite?

So essentially, if the universe is of infinite magnitude, it cannot possibly be expanding into anything. Rather, it’s stretching (it’s a fine distinction, but an important one). Simply put, every region of the universe, every distance between every pair of galaxies, is being “stretched,” pulled apart like taffy.

## Is the past infinite?

Each year is separated from any other by a finite number of years (remember that there’s no first year). There never was a time when the past became infinite because no set can become infinite by adding any finite number of members. So, if the past is infinite, then it has always been infinite.

## Is there a number bigger than infinity?

The concept of infinity varies accordingly. Mathematically, if we see infinity is the unimaginable end of the number line. As no number is imagined beyond it(no real number is larger than infinity).