When big rocks slammed into the Red Planet, US space agency missions were able to record the events.
The post-impact observation shows huge chunks of buried water-ice have been excavated and thrown around the edges of the crater. Buried water-ice has never before been seen so close to Mars' equator."That ice can be converted into water, oxygen or hydrogen. That could be really useful," said Dr Lori Glaze, Nasa's director of planetary science.
The vast majority of quakes picked up by InSight have produced the traditional primary and secondary waves associated with rock movements deep within the planet.Image caption,"This is the first-time seismic surface waves have been observed on a planet other than Earth. Not even the Apollo missions to the Moon managed it," said Doyeon Kim from ETH Zurich's Institute of Geophysics and a lead author on the scholarly reports appearing in Science Magazine this week.
Scientists think both impacts can provide fresh knowledge about Mars' interior. Whereas the deeply sourced quakes tell them about the structures and positions of the planet's mantle and core, the surface waves reveal new details about the overlying crust.
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