> [!infobox] <s class="aside-in"><em>mentioned in 16 topics, 4 evergreens</em></s> #### <s class="topic-title">[[universe]]</s> > [!wikipedia] [universe](https://en.wikipedia.org/wiki/Universe) > > The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. [[The Big Bang]] theory is the prevailing cosmological description of the development of the universe. While the spatial size of the entire universe is unknown, the cosmic inflation equation indicates that it must have a minimum diameter of 23 trillion [[lightyears]], and it is possible to measure the size of the observable universe, which is approximately 93 billion [[lightyears|light-years]] in diameter at the present day. > **See**:: [[expanding universe]], [[dark matter]], [[spacetime]] #### Related - [[Religion as an explanation of the origin of the universe]]