What happens to matter in the context of Steady State Theory?

In the context of Steady State Theory, the correct understanding is that matter remains constant over time, replenished as the universe expands. This theory posits that the universe is expanding, but as it does so, new matter is created to maintain a uniform density. Therefore, the total amount of matter does not change, resulting in a constant population of galaxies, rather than them being dispersed or absorbed over time.

The idea of matter entering through white holes is not supported by the Steady State Theory; rather, matter is created uniformly throughout the expanding universe while still keeping the overall density unchanged. This stands in contrast to other theories, such as the Big Bang theory, which describes a different evolutionary path for the universe. Thus, the concept of matter staying constant is a key aspect to understanding Steady State Theory, as it emphasizes a static total density despite the universe's expansion.