主題: Ultra_diffuse_galaxy超稀疏星系 df20 作者: peter 於 2016-11-30 13:07:45 https://astronomynow.com/2016/11/29/mystery-of-ultra-diffuse-faint-galaxies-solved/
(https://astronomynow.com/wp-content/uploads/2016/11/diffuse_galaxies2_683x683.jpg) (https://astronomynow.com/wp-content/uploads/2016/11/diffuse_galaxies4_939x683.jpg) wiki https://en.wikipedia.org/wiki/Ultra_diffuse_galaxy 是一種物質密度極低的星系。這類星系的體積可能和我們的銀河系相同,但恆星數只有銀河系的1%。這類星系因為缺乏恆星形成的氣體而使其光度極低,結果就是星系內的恆星相當古老 |