Martian canyon

日期:2019-02-26 02:13:01 作者:鲜杖 阅读:

THE latest pictures from the Mars Global Surveyor, now in orbit round the Red Planet, have revealed a chasm more than twice as deep as the Grand Canyon, NASA scientists announced last week. “It’s extremely steep-sided,” says project scientist Arden Albee of the California Institute of Technology in Pasadena. Although the rift is part of a larger fracture pattern that has been seen before, no one realised how deep it was, says Albee. Surveyor measured it while gearing up for an extensive mapping of Mars to begin in six months. The canyon is 13 kilometres from rim to rim and 4 kilometres deep,