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Three Raptor engines for the 20-kilometer flight
Six Raptor engines for an orbital flight with an expendable Starship without cargo
30 Raptor engines for an orbital flight with a minimal Super-heavy booster and Starship
Elon also tweeted that SpaceX was selected by NASA to launch the DART mission. This will be precursor mission to develop the capabilites to deflect asteroids.
SpaceX's Starship and Super Heavy rocket are designed to deliver satellites to Earth orbit and beyond, at a lower marginal cost per launch than our current Falcon vehicles. With a 9m diameter forward payload compartment, larger than any other current or planned fairing, Starship creates possibilities for new missions, including space telescopes even larger than the James Webb.