Galactic Year: Scientists Calculate How Long It Lasts

Galactic Year: Scientists Calculate How Long It Lasts

Man is accustomed to counting time as it measures motion on the Earth relative to the Sun. And science proposed to calculate all space travel and movement from the account of one Earth year or one Earth day. But these time frames are insignificant compared to the time period that covers our entire Solar System. Keith Hawkins, who is an assistant professor of astronomy at the University of Texas at Austin, believes that he and his colleagues have always wondered how long the Earth time is in one Galactic year.

Today he says that he managed to calculate the time period. One revolution around the Milky Way galaxy takes from 220 to 230 million Earth years. In other words, if we measure time with the galactic "clock", then today's Earth would be 16 galactic years, the Sun is about 20 galactic years, and the Universe is about 60 years old.

The Solar System moves through the Galaxy in much the same way as the Earth revolves around the Sun. But the Sun does not revolve around the star; its place is taken by a supermassive black hole located in the very center of the Galaxy. It has a tremendous gravitational effect on everything in the Milky Way.

The speed of the Sun is about 230 km/sec, it is equivalent to 804 thousand km/h. The speed allows it to rotate around the center of the Galaxy instead of being sucked into a Black Hole. Compared to the Earth year, the galactic year presents a picture of time on a huge scale.

The scientists say that we think of as a galactic year depends on the Earth's position in the Milky Way's spiral. All the Galaxies have a different time period, if in our Galaxy it is about 230 million years, then in other galaxies that period can be much longer. The Galaxy is about 100,000 light-years across.

And the Earth is about 28 thousand light years. Keith Hawkins believes that if the Galaxy is presented as a city, then the Earth will be a small suburb. For those stars that orbit around a Black Hole, which can be conventionally considered as the center of the city, within these limits the galactic year is relatively short.

And in the suburbs that are the Solar System, respectively, the galactic year becomes longer. For example, the Mercury orbits the Sun in about 88 Earth days. And the Uranus revolves around the Sun once in 84 Earth years.