The universe is the totality of space and time, embracing everything that exists — matter, energy, planets, stars, galaxies, and the invisible laws that govern them. It is believed to be around 13.8 billion years old, born from the Big Bang, a moment when time and space first unfolded.
Since then, the universe has been expanding endlessly, shaping itself into galaxies, clusters, and superclusters. What we see through our telescopes is only a tiny fraction of its true magnitude, for most of the cosmos is hidden in the form of dark matter and dark energy.