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作者:钱四    发布时间:2019-03-07 03:06:16    

ON closer examination, Mars does not appear to have the ancient coastlines apparently visible on earlier images of the planet. Astronomers had interpreted features from Viking images of the northern lowlands as beaches, cliffs and spits formed by a now vanished ocean. Laser altimeter measurements from Mars Global Surveyor supported this interpretation, as they indicated that the supposed shoreline was nearly level. But high-resolution images from the spacecraft’s camera do not show coastal features in the places shown in the Viking images, Ken Edgett of Malin Space Science Systems in San Diego reports in the latest issue of Geophysical Research Letters. Ancient shorelines are hard to spot on images of the Earth from space, and the same may be true of Mars. “I wouldn’t give up on the idea of large standing bodies of water,” says Edgett,

 

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