The universe is constantly evolving and expanding, which limits our ability to observe it. The following factors contribute to this limitation:

- Time: The universe has been evolving with time, and stars and galaxies did not always exist. Therefore, light from most of the galaxies in the universe has not yet had time to reach us. This means that we can never truly behold objects that have sprouted before the dawn of starlight.

- Expansion: The universe has been relentlessly expanding with time, and in a uniformly expanding universe, it is inevitable that there is a distance beyond which the apparent recession speed is faster than the speed of light so that light can't catch up. This bleak frontier, the cosmological horizon, might well extend infinitely, barricading within its depths secrets of unfathomable proportion.

If we could suddenly freeze time everywhere in the universe, we would find galaxies extending out far beyond what we can see today. However, this is not something we will have access to in the near future. It is difficult to grasp how we could ever hope to understand a universe that actively expands faster than we can observe it. However, scientists can infer the presence of objects beyond our observable universe by studying their effect on nearby matter. The universe is infinite in size, so there is no outside to talk about. However, there is an outside to our observable patch of the universe, which is limited by the amount of time that has passed since the Big Bang and the speed of light.
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