GW 123.4-1.5（Galactic Worm 123.4-1.5）是一个质量大约为105 MSun的中性氢云 [1]。它有着不寻常的蘑菇状结构，可能是从银河系盘面坠落，撞击并通过盘面所造成的结果。理论上，这个高速云可能是在5×107 年前，以100 km/s 的速度撞击的[2]。
参考资料
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