Add link to "exploration of x" or "list of proposed missions to x" to exploration or see also section, transpose all content there if it is not there already
Create "proposed missions to x" list, transpose relevant content there (only if there are several proposed missions)
Create "exploration of x" article, populate with relevant info from main article, rm spec missions from main
Crazy idea: make central "list proposed space missions" page
Long-term goal: improve degraded planet pages to deserve FA status (possible FARs)