The Universe is all of space and time and its contents. These include planets, moons, minor planets, stars, galaxies, the contents of intergalactic space and all matter and energy. The Universe encompasses all of life and all of history. But just how old is the universe?
According to the latest research, the universe is approximately 13.7 billion years old. This age is calculated by measuring the distances and radial velocities of other galaxies.
The Big Bang theory is the prevailing cosmological description of the development of the Universe. Under this theory, space and time emerged together around 13.799 billion years ago. After the initial expansion, the Universe cooled and eventually giant clouds later merged through gravity to form galaxies, stars, and everything we see today.
It is possible to see objects that are now further away than 13.799 billion light-years because space itself has expanded. This means that objects which are now 46 billion light years away can still be seen in their distant past because at that time they were much closer to us.
The European Space Agency’s Planck telescope, which was launched in 2009, created an accurate and detailed map of the oldest light in the Universe. The telescope scanned the skies, mapping the cosmic microwave background of the big bang that created our universe. This relic radiation provides scientists with a snapshot of the universe 370,000 years after the big bang. This information helped astronomers determine the age of the universe.