 In 1970 he became romantically involved with Inge @-@ Juliana Sackman , a fellow physicist 26 years his junior . He divorced Dagmar in early 1971 , and married Juliana on August 4 , 1973 . They had two daughters , Illia Juliana Lilly Christy , born in 1974 , and Alexandra Roberta ( Alexa ) Christy , born in 1976 . 
