Universe Size Comparison - 2021

In this video, we explore the sizes of moons, planets, stars, and even beyond, including black holes and even galaxies. The universe is all of space and time and its 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. According to the estimation of this theory, space and time emerged together 13.799±0.021 billion years ago, and the universe has been expanding ever since. 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 light-years, and it is possible to measure the size of the observable universe, which is approximately 93 billion light-years in diameter at the present day. There are many competing hypotheses about the ultimate fate of the universe and about what, if anything, preceded the Big Bang, while other physicists and philosophers refuse to speculate, doubting that information about prior states will ever be accessible. Some physicists have suggested various multiverse hypotheses, in which our universe might be one among many universes that likewise exist. Credit: ESA/Hubble Times Infinity European Southern Observatory (ESO) #SkyeBeatt