SpaceX
What Is Starship? SpaceX's Mars Rocket, Explained
Starship is SpaceX's giant, fully reusable rocket built for the Moon and Mars. Here's what it is, how it compares to Falcon 9, and why it matters.
Starship is the giant, fully reusable rocket being developed by SpaceX — the most powerful launch vehicle ever built. It’s the centerpiece of Elon Musk’s long-term goal of sending people to Mars, and it’s also slated to land astronauts on the Moon. Where the Falcon 9 is SpaceX’s reliable workhorse, Starship is the moonshot: bigger, bolder and designed to be fully reusable.
How big is Starship?
Standing roughly 120 meters (about 400 feet) tall, Starship is the largest and most powerful rocket ever flown. It’s built from stainless steel — an unusual, cheaper choice that handles the heat of re-entry — and is designed to lift enormous payloads to orbit in a single launch.
The two stages
Starship is a two-part system, and confusingly, “Starship” refers to both the whole rocket and its upper stage:
- Super Heavy — the massive booster at the bottom, powered by 33 Raptor engines. We break the engine count down in how many engines Starship has.
- Starship — the upper stage and spacecraft that carries crew or cargo, with its own Raptor engines.
Both stages are meant to fly back and be reused, which is the heart of the design.
What makes it different
Falcon 9 reuses only its first stage; Starship is designed so that both the booster and the ship come back and fly again. Its Raptor engines burn methane and liquid oxygen — propellants that could, in theory, be made on Mars. Full reusability plus huge capacity is what could push the cost of reaching space down to a fraction of today’s.
Starship vs Falcon 9
- Falcon 9 — proven, partially reusable, flies constantly, lifts satellites and Dragon.
- Starship — far larger, fully reusable, still in testing, aimed at the Moon, Mars and the heaviest payloads.
They’re built for different jobs: Falcon 9 for today’s routine launches, Starship for the next leap.
What it’s for
SpaceX envisions Starship carrying large satellite batches, landing NASA astronauts on the Moon, and eventually ferrying people and supplies to Mars. It’s still working through an iterative, test-heavy development program — but if it succeeds, it changes what’s possible in space.
FAQ
What is Starship used for?
It’s designed to launch heavy payloads, land astronauts on the Moon, and ultimately carry people and cargo to Mars. SpaceX also plans to use it for large batches of satellites.
How is Starship different from Falcon 9?
Falcon 9 is a proven rocket that reuses only its first stage. Starship is much larger and designed to be fully reusable — both the booster and the ship — but is still in testing.
How tall is Starship?
About 120 meters (roughly 400 feet) when stacked, making it the largest and most powerful rocket ever built.
Will Starship really go to Mars?
That’s its long-term purpose, and the reason SpaceX exists. The timeline is uncertain and development is ongoing, but Mars is the explicit goal driving the design.
Spaceflight programs evolve rapidly. This explainer covers the durable basics and is reviewed periodically.