Galaxies Revolve Once A Billion Years- DO YOU KNOW?
New Delhi : Have you ever wondered about those million stars, stellar remnants, dark matter and so on moving in the galaxy? If you are interested the word 'Galaxy' then this article will surely make you spell-bound. Scientists reveal that our galaxy rotates once every billion years.
Call it a cosmic clock or anything you like, it is just similar to the way our Earth revolves on its axis and around the Sun. Known to all that, a galaxy is gravitational system marked with unlimited stars, stellar remnants, interstellar gas, dust and dark matter.
All this objects are constantly spinning in an eerie symmetry. A recent study says that all of them take about a million years to complete one spin, irrespective of their size.
Experts at the International Centre for Radio Astronomy Research (ICRAR) say that the kind of spin of the galaxies is not "Swiss Watch Precision". However, there is a definite level of accuracy, which is sufficient to cover all the galaxies in the night sky (as mentioned in Phys.org.)
In a discussion, Professor Gerhardt Meure explained "But regardless of whether a galaxy is very big or very small, if you could sit on the extreme edge of its disk as it spins, it would take you about a billion years to go all the way round," He further added that all galaxies have approximately the same size and can be proved to have similar interior densities. This discovery by the professor has lead to the better understanding of the Milky Way, its formation and function.
Adding some more valuable points, Meure said, "You won't find a dense galaxy rotating quickly; while another with the same size but lower density is rotating more slowly." His team has also discovered a lot more about a number of old stars that is present outside the edge of galaxies.
The finding a small group of young stars at the border of the galaxies came out interesting when they came to know some hidden facts.
The professor said "But instead of finding just gas and newly formed stars at the edges of their disks, we also found a significant population of older stars along with the thin smattering of young stars and interstellar gas.
So because of this work, we now know that galaxies rotate once every billion years, with a sharp edge that's populated with a mixture of interstellar gas, with both old and young stars."
The discovery made by the astronomers has brought a new remarkable point in Astronomical Science. Researchers mentioned that despite the regular movements of galaxies, they are likely to have a collision with each other.
For instance, the Milky Way may tend to collide with Andromeda (a spiral galaxy which is nearest galaxy to the Milky Way) to form a new one. Scientists say that the process will take some billon of years and the result will be extraordinary.
The collision will result in billion of newly born stars from combining nebulas; the giant black holes and some more heavenly objects which will look amazing.