Mir space station.  Fiery demise spells end of longest research run.
Savelyeva
E
E
Allakhverdov
A
A
Lawler
A
A
D000818:Animals; D005118:Extraterrestrial Environment; D006801:Humans; D010829:Physiological Phenomena; D012106:Research; D012426:Russia; D018531:Spacecraft; D014893:Weightlessness