ISSN: 2456-7663
Peer-reviewed Science Magazine

Astronomer Discover All Galaxies Rotate Once Every Billion Years

Astronomers have discovered that all galaxies rotate once every billion years, no matter how enormous they are.

All image Credit: ESA/NASA (Hubble)
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the colossal Pinwheel galaxy, extraordinary compared to other known cases of “grand design spirals”, and its supergiant star-shaping regions in remarkable detail. The picture is the largest and most detailed photograph of a spiral galaxy ever captured by Hubble.

The Earth turning around on its pivot once gives us the length of a day, and an entire circle of the Earth around the Sun gives us a year. “It’s not Swiss watch precision, 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 around,” said Professor Gerhardt Meurer from the UWA hub of the International Center for Radio Astronomy Research (ICRAR).


Teacher Meurer said that by utilizing basic maths, you can demonstrate all universes of a similar size have a similar normal inside thickness.

“Discovering such regularity in galaxies really helps us to better understand the mechanics that make them tick-you won’t find a dense galaxy rotating quickly, while another with the same size but lower density is rotating more slowly,” he said.


Teacher Meurer and his group additionally discovered proof of more seasoned stars existing out to the edge of cosmic systems.

“Based on existing models, we expected to find a thin population of young stars at the very edge of the galactic disks we studied,” he 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. This is an important result because knowing where a galaxy ends means we astronomers can limit our observations and not waste time, effort and computer processing power on studying data from beyond that point,” said Professor Meurer.

“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. When the SKA comes online in the next decade, we’ll need as much help as we can get to characterize the billions of galaxies these telescopes will soon make available to us.”

Educator Meurer said that the up and coming age of radio telescopes, similar to the destined to-be-manufactured Square Kilometer Array (SKA), will create huge measures of information, and knowing where the edge of galaxy untruths will decrease the handling power expected to seek through the information.

Source / Journal International Centre for Radio Astronomy Research Royal Astronomical Society

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