spiral front 中文意思是什麼
spiral front
解釋
螺旋前沿-
It says that the stars indeed rotate at different speed, but the density of the interstellar medium form a wave. at the wave front, where the density is higher, star formation is enhanced. that is why we find young stars along the spiral arms and old stars elsewhere
這個理論認為雖然恆星會以不同速度移動,但星際物質的密度會產生波動,在密度最高的波陣面會催生出新的恆星,這解釋了為何通常在旋臂會找到新生恆星,而在其他地方只有古老恆星的原因。
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