Proper noun
The vast lava plain on the Moon.
The basin on the Moon.
The asteroid impact that created these basin and plain on the Moon.
Source: en.wiktionary.orgIn making the final landing site decision, mission planners took into consideration the primary objectives for Apollo 17: obtaining old highlands material from a substantial distance from Mare Imbrium, sampling material from young volcanic activity (i. Source: Internet
Geologists feared, however, that samples obtained from the crater might have been contaminated by the Imbrium impact, thus preventing Apollo 16 from obtaining samples of pre-Imbrium material. Source: Internet
Likewise, Apollo 15 had also sampled material in the region of Imbrium, visiting the basin's edge. Source: Internet
The Cayley Formation's age was approximated to be about the same as Mare Imbrium based on the local frequency of impact craters. Source: Internet
This would include a convert expedition in pressurized rovers to the crater Harpalus and the Mare Imbrium foothills. Source: Internet