Sidious gives Order 66 to all of the clone troop commanders which states to kill all Jedi. Only Yoda and Obi-Wan survive. Darth Vader leads a team of Clone Troopers to the Jedi Temple and all Jedi die. Not long after, Sidious appoints himself Emperor and declares the Republic a Galactic Empire. Anakin is ordered by Sidious to go to the lava planet Mustafar to kill the Separatist leaders. Yoda goes to confront the newly appointed Emperor and they duel throughout the Senate Chamber. Yoda flees from the battle after realizing that he cannot defeat Sidious. Obi-Wan defeats Anakin on Mustafar, leaving him critically injured on the banks of a lava river. Padme dies in childbirth, after Luke and Leia are born. Leia is given to Senator Bail Organa, to live in disguise as his daughter. Luke is given to his remaining Skywalker family on tattooine to live in secret. Obi Wan lives on tattooine in exile in order to watch over Luke, and during this time studies the force and all its mysteries. The last shot then shows Emperor Palpatine and Darth Vader watch over the beginning construction of the Death Star.
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Chosen answer: Powerful force users seem to have some degree of control over their bodies even after death. In the later series, Luke's wife Mara Jade Skywalker only allows her body to disappear when her killer, and nephew Jacen Solo arrives at her funeral as a clue. Thus it appears that a powerful force user can simply choose if they wish their body to disappear.
Darius Angel