The Denver Nuggets started off as the Denver Rockets in the 1967-1968 ABA league. They changed their name to the Nuggets for the 1974-1975 season which was just a couple years before their merge into the NBA.
They then merged into the NBA between the 1975-76 season and the 1976-77 season. During their ABA and NBA years, they made the playoffs in 21 of their first 23 seasons. Talk about impressive, that is incredible.
The Denver Nuggets will soon be entering their 50th season in the NBA, and it will certainly be an exciting time in Denver, and with such a promising young lineup, the team will soon come back to relevance.