The universe is the vast expanse that includes everything in existence: matter, energy, space, and time. It began approximately 13.8 billion years ago with the Big Bang, an event that marked the rapid expansion of an infinitely dense singularity. The universe is composed of billions of galaxies, each containing stars, planets, and other celestial objects, separated by immense distances.
The Big Bang is a theory about how the universe started and the formation of stars and galaxies. The universe was very hot, small and dense with no stars, atoms, form, or structure called a singularity. then inflated over the next 13.8 billion years to the cosmos that we know today.
The universe is governed by fundamental forces such as gravity and continues to expand, with its ultimate fate still uncertain. Scientists study the universe to understand its origins, structure, and the physical laws that shape it. Astronomers estimate the age of the universe by looking for the oldest stars; and by measuring the rate of expansion. The universe cannot be younger than the objects contained inside of it. By determining the ages of the oldest stars, scientists are able to put a limit on the age.
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