To better understand the mass and structure of these stellar ejecta and track their velocity, NASA has turned to the dual STEREO (Solar TErrestrial RElations Observatory) satellites.

• 为了更好地了解这些恒星抛射物的质量和结构，并测量它们的速度，NASA把目光转向了双重“立体声”（STEREO，由“日地关系天文台”的首字母缩写而来）卫星。