The SPA basin as a whole is largely unfilled by mare lavas, whereas even the smallest basin on the near side tends to have copious lava fill.
The SPA basin as a whole is largely unfilled by mare lavas, whereas even the smallest basin on the near side tends to have copious lava fill.
整体而言，大部份的SPA盆地没有被月海岩浆填满，即使是近地面最小的盆地也被大量的岩浆所填充。