I cannot but others can. Your welcoming me.
The 1950s when Russia sent the first artificial satellite "Sputnik 1" (1957) https://history.state.gov/milestones/1953-1960/sputnik#:~:text=On%20October%204%2C%201957%2C%20the,accomplish%20this%20scientific%20advancement%20first.
Maritime polar because it's so cold And doesn't have a lot of density
