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Planetary scientists know that the more craters on a surface, the older it is ; the fewer craters, the younger the surface. That's a nice relative determination, but to put absolute age dates on that, one has to have samples from those surfaces. The Apollo samples gave us a number of surfaces that we were able to date and correlate with crater densities. This cratering chronology has been extended to other planets -- for example, for Mercury and Mars -- to say that surfaces with a certain density of craters have a certain age.
Found on CNN 3 years ago
The consortium includes members from China, Australia, the U.S., the U.K. and Sweden, this is science done in the ideal way : an international collaboration, with free sharing of data and knowledge -- and all done in the most collegial way possible. This is diplomacy by science.
Found on CNN 3 years ago
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