Lets have a look at a for instance arising from relativity.
The universe is thought to have originated some 10 to 20 billion of our years ago in a big bang. This theory has been modified to include an inflation stage and is more recently subject to challenge. Anyway, the components of the bang have been flying apart ever since, gradually slowed by gravitational attraction. Due to the finite speed of light we observe objects at a distance from us as they were in the past when they were receding faster. Consequently, on a galactic scale, the further away we look the faster the recession velocity we observe, the edge, called the Hubble Limit, occurs where this velocity reaches the speed of light.