Our Milky Way Galaxy- Credit: Foto: NASA/JPL

Galactic year is also known as cosmic year. Everything in the universe is in motion, and most small-mass celestial bodies revolve around larger celestial bodies. Our world and the other 7 planets turn around the sun. Well, is there a center where our sun turns around?

Our sun is just one of the 100 billions of stars in the Milky Way galaxy. The Sun also revolves around the center of the Milky Way galaxy. The center of the Milky Way is thought to have large black holes and these black holes creates a great gravitational force. Our sun completes a full round around the center of our galaxy from 225 million to 250 million years. Our sun is approximately 4.6 billion years old. From this point of view, it can be calculated that the sun revolved around galaxy center 20 times throughout our galaxy. Only one tour ago, dinosaurs were ruling to the world. It is quite difficult to predict what might happen after a tour, but it is certain that there will be big changes.

For a galactic year between 225 million and 250 million years for our sun, the galactic year is different for the celestial bodies that are closer or farther to the center of the galaxy. The celestial bodies, which are close to the center of the galaxy, take more tours while the far ones take less. What is interesting here is the fact that the celestial bodies, which are at the farthest point of the galaxy, complete the tour of 1 billion years of celestial bodies. This applies to all spiral galaxies, regardless of their magnitudes. In other words, a galactic year can be no more than 1 billion, and the galactic years of the celestial bodies in the galaxy (or the time to circle around the galaxy center) will shorten as they approach the center of the galaxy.