One group, led by Dieter Heymann of Rice University, had proposed that the exotic carbon was part of the soot that accumulated in the wake of the massive, impact-ignited fires.

• 由美国莱斯大学海曼领导的团队发表过报告，指出巨大撞击引发大火后，遗留的煤灰中有外来的碳。