But the new result is controversial.
Asteroids threatening Earth could be spotted by network of spacecraft near Venus' orbit, Chinese scientists say
Anna Łosiak, who researches craters at the Polish Academy of Sciences, said the rings identified in the new study may not be crater features after all. If they truly are, she added, the implications are worrisome, because"there are a lot of space rocks that may come and make a mess." Similarly, Canadian planetary scientist Gordon Osinski, a Western University professor leading the science team on the country's forthcoming lunar rover, said he could not conclusively identify rims in the study's data."Those features are so subtle that I don't think they say 'big structural rim,'" he said.
Garvin's team based their work on two space assets that use lidar altimetry and commercial stereo imaging available from private companies Planet and Maxar. The scientists argue that the newer data, given their higher resolution of 13 feet or less, is a"major improvement over existing topography" used for impact calculations, like NASADEM and Germany's TanDEM-X SAR that offer 100 feet and 40 feet resolution, respectively.
Garvin told Science that, without fieldwork,"we haven't proven anything," which was echoed in yet another conversation with Bill Bottke, a planetary dynamicist at the Southwest Research Institute in Boulder, Colorado."I'm skeptical. I want to see a lot more before I believe it," Bottke said.
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