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The Earth spins a circle is a day, a circle around the sun is a year, the sun rotates around the center of the Milky Way, that the Milky Way circle how long does it take? A new study says it's a billion years old, and all galaxies made up of a large number of stars do, and it takes about a billion years to rotate.
researchers from institutions such as the Australian International Radio Astronomy Research Centre published their findings in the Monthly Journal of the Royal Astronomical Society.
their calculations show that the speed at which galaxies rotate is independent of size.
"Whether a galaxy is large or small, if you sit on the outermost edge of its disk and rotate, it will take you about a billion years to rotate."
," said Professor Gerhard Moyrere of the International Centre for Radio Astronomy.
Moyrere says finding this rotational cycle between different galaxies could help improve understanding of the internal structure of galaxies.
Source: Xinhua.com