The term EX-CONSTELLATION is a combination of two words: 'EX' and 'CONSTELLATION'. The first word, 'EX', is a prefix meaning 'FORMER' or 'out of'. The second word, 'CONSTELLATION', refers to a group of stars that form a recognizable pattern in the night sky. Together, the term EX-CONSTELLATION can be interpreted as a FORMER group of stars, or a group of stars that have been broken up. The crossword solution ARGO is a reference to the Greek mythological ship of the same name, which was used by Jason and the Argonauts to search for the Golden Fleece. This is symbolic of the idea of a FORMER CONSTELLATION, as the Argonauts were searching for something that had been lost.