SpaceX is testing the SN15 Starship prototype which is the first of an upgrade batch of five Starship prototypes. The BN1 booster is assembled and close to the start of ground testing. The BN1 booster will not be flown. The SN20-SN24 batch of Starships and the BN3 or BN4 super-heavy boosters should be the first ones flown to orbit in the late summer of 2021. The current status of SpaceX's Starship & Superheavy prototypes. 10th April 2021 pic.twitter.com/RLwQM96wCk — Brendan (@_brendan_lewis) April 9, 2021 SN15 completed the Ambient Pressure test. SOURCES- SpaceX Written By Brian Wang, Nextbigfuture.com

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