科学家发现火星古老的海岸线环在北方平原. Scientists identify ancient Martian shoreline ring in northern plains.

发表在"自然"杂志上的新研究发现火星上有一种环状的特征, New research published in Nature identifies a ring-like feature on Mars that likely marks the ancient shoreline of a vast ocean in the planet's northern plains. 这项由加州理工学院研究人员领导的研究表明, 随着河流沉积堆而形成了数百万年的"浴环", The study, led by Caltech researchers, suggests this "bathtub ring" formed over millions of years as rivers deposited sediment, indicating a long-lived, wetter climate on the Red Planet billions of years ago.