星系自轉 The Most Massive Galaxies Spin More Than Twice as Fast as the Milky Way

[peter]

https://www.universetoday.com/143784/the-most-massive-galaxies-spin-more-than-twice-as-fast-as-the-milky-way/#more-143784


our planet has nothing on the Sun itself, which travels around the center of our galaxy at a velocity of 220 km/s (792,000 km/h; 492,000 mph)


with the largest spinning at a rate of up to 570 km/s (350 mps) – almost three times as fast


https://zh.wikipedia.org/wiki/%E6%98%9F%E7%B3%BB%E8%87%AA%E8%BD%89%E5%95%8F%E9%A1%8C

[peter]

https://technews.tw/2019/10/23/super-spirals-mond-milky-way-dark-matter-gravity-theory/

包括太陽系在內，整個銀河系以每秒約 210 公里的速度旋轉著，只是我們感受不到。而最近天文學家發現，比銀河系更大的螺旋星系其轉速超乎預期得快，每秒高達 570 公里，推測暗物質可能是其中提速關鍵。