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Astronomers discover galaxies spin like clockwork
Astronomers have discovered that all galaxies rotate once every billion years, no matter how big they are.
The Earth spinning around on its axis once gives us the length of a day, and a complete orbit of the Earth around the Sun gives us a year.
"It's not Swiss watch precision," said Professor Gerhardt Meurer from the UWA node of the International Centre for Radio Astronomy Research (ICRAR).
https://phys.org/news/2018-03-astron...kwork.html#jCp
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