Ancient Mars was warm and wet, not cold and icy
摘要
一项最新研究表明，数十亿年前的火星气候温暖湿润，而非寒冷多冰。这一发现与先前认为该时期火星主要为寒冷冰封状态的理论形成对比，并对火星当时可能存在生命发展的观点具有启示意义。研究聚焦于约41亿至37亿年前的诺亚纪时期，该时期处于太阳系历史上的晚期重轰炸阶段，太阳系内多个天体均发现了当时巨大陨石撞击的证据。
A recent study showed that Mars was warm and wet billions of years ago. The finding contrasts with another theory that this era was mainly cold and icy. The result has implications for the idea that life could have developed on the planet at this time.
Whether Mars was once habitable is a fascinating and intensely researched topic of interest over many decades. Mars, like the Earth, is about 4.5 billion years old and its geological history is divided into different epochs of time.
The latest paper relates to Mars during a time called the Noachian epoch, which extended from about 4.1 to 3.7 billion years ago. This was during a stage in solar system history called the Late Heavy Bombardment (LHB). Evidence for truly cataclysmic meteorite impacts during the LHB are found on many bodies throughout the solar system.
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