You can even see how the collision has shaped the gas, forming a bow shock in one cluster like the waves of water created by a rapidly moving boat.
你甚至可以看到碰撞是如何形成气体的，在一个星团中形成弓形冲击，就像快速移动的船只所产生的水波。
Bow Shock
原声例句
Crash Course 天文篇
中文百科
弓形震波 Bow shocks in astrophysics
（重定向自Bow Shock）
弓形激波（Bow shock）是太阳风与行星的磁层顶相遇处形成的激波。一个已经被深入研究的例子是太阳风与地球磁场相遇时形成的弓形激波。地球的弓形激波距离地球大约9万公里，厚度大约为100-1000公里
弓形激波的判别条件是此处流体的整体速度从超音速降低到亚音速以下。等离子体的声速为
其中cs为声速，
是等压热容与等体热率之比，p是压强，
是等离子体的密度。
太阳风中的带电粒子沿着螺旋性的轨迹沿磁力线运动，它们围绕磁力线的运动类似于普通气体当中的热运动，平均热运动的速度近似为声速。在弓形激波处整体速度降低到粒子围绕磁力线的运动速度以下。
英语百科
Bow shocks in astrophysics 弓形震波
（重定向自Bow Shock）
![The bow shock around R Hydrae[10]](/uploads/202501/01/Sig06-029_medium1144.jpg)
Bow shocks form the boundary between a magnetosphere and an ambient magnetized medium. This occurs when the magnetic field of an astrophysical object interacts with the nearby flowing ambient plasma. For example, when the solar wind, flowing with a relative speed of order 400 km/s, encounters the magnetic field of Earth, a bow shape boundary forms. For Earth and other magnetized planets, it is the boundary at which the speed of the stellar wind abruptly drops as a result of its approach to the magnetopause. For stars, this boundary is typically the edge of the astrosphere, where the stellar wind meets the interstellar medium.
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