query: SELECT DISTINCT ?item ?daysinspace
  WHERE {
    ?item wdt:P31 wd:Q5 . #person is instance of human
    ?item wdt:P106 wd:Q11631 . # person has occupation astronaut
    ?item wdt:P2873 ?timeinspace . # person has occupation astronaut  
    BIND((ROUND(?timeinspace / 60 / 24 )) AS ?daysinspace) 
    {?item ?property1 wd:Q213439 } UNION {?item ?property2 [wdt:P361 wd:Q213439] }. #person has some relationship to UVa
  }
  ORDER BY DESC(?daysinspace)