Scientists say fresh evidence supports the theory that a monster impact punched the red planet, leaving behind perhaps the largest gash on any heavenly body in the solar system.

• 科学家提出了一个支持这一理论的新证据，一个巨大的撞击猛撞了这颗红色的行星，留下可能是太阳系所有天体中最大的深痕。