"Challenger Day"@en . . . "Challenger Day was an annual holiday on the Belle Terre colony, commemorating the exploits of local hero Nick Keller and the crew of the USS Challenger. It was observed on 20 January. (Star Trek: Pendragon, Junction Point)"@en . "Challenger Day was an annual holiday on the Belle Terre colony, commemorating the exploits of local hero Nick Keller and the crew of the USS Challenger. It was observed on 20 January. (Star Trek: Pendragon, Junction Point)"@en . .