Tags: Rocket.
The Thor-Ablestar or Thor Able-Star also known as Thor-Epsilon was an early American expendable launch system consisting of a PGM-17 Thor missile with an Ablestar upper stage. It was a member of the Thor family of rockets and was derived from the Thor-Able.The Ablestar second stage was an enlarged version of the Able which gave the Thor-Ablestar a greater payload capacity compared to the Thor-Able.