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SpaceX's Starship test 3 aims to push the boundaries of the super heavy launch vehicle in several ways. Here are the key objectives:

Successful burns of both stages: This is a core goal, ensuring both the Super Heavy booster and Starship upper stage fire their engines effectively during ascent.
Testing Starship's functionalities: This includes opening and closing the payload door, a critical function for future cargo and crew missions.
In-space propellant transfer: Demonstrating the ability to transfer fuel between tanks while in space is crucial for Starship's reusability and missions requiring long durations in orbit.
First ever Raptor engine relight in space: Relighting engines in space allows for maneuvers and course corrections, a vital capability for future missions.
Controlled reentry and splashdown: Starship needs to safely reenter the atmosphere and achieve a controlled ocean landing.
This test flight also features a new trajectory with a splashdown target in the Indian Ocean. This path allows SpaceX to attempt new maneuvers like in-space engine burns while maintaining public safety.

Overall, this mission is a significant step in developing Starship's capabilities for future space exploration, including NASA's Artemis missions.