article_snippet.sent: Following liftoff, the combined vehicles accelerate for approximately two and a half minutes.
article_snippet.sent: The Propulsion Module then shuts off The Propulsion Module rocket engines and separates from the Crew Capsule.
article_snippet.sent: The Propulsion Module will finish The Propulsion Module flight, descend to Earth, and autonomously perform a rocket-powered vertical landing.
article_snippet.sent: This is known as vertical takeoff, vertical landing (VTVL).
article_snippet.sent: Assembly of propulsion module serial numbers 2 and 3 is already underway -