행성은 굉장히 크고 두꺼운 대기를 갖고 있으며, 태양계의 어느 곳 보다도 지표면 환경이 우리 지구의 환경과 유사하거나 적어도 과거에 그랬을 것이라고 믿었습니다.
It has a very large, thick atmosphere, and in fact, its surface environment was believed to be more like the environment we have here on the Earth, or at least had in the past, than any other body in the solar system.