What Is SpaceX? Elon Musk's Rocket Company, Explained

SpaceX — short for Space Exploration Technologies — is the rocket and spacecraft company founded by Elon Musk in 2002. Its goal is to slash the cost of getting to space, ultimately to help make humanity “multi-planetary.” Along the way it has become the dominant launch provider on Earth, the company that made rockets reusable, and the operator of the world’s largest satellite network. In June 2026 it went public in the largest IPO in U.S. history — and, having absorbed Elon Musk’s AI company xAI, it’s now a major force in artificial intelligence too, not just spaceflight.

What SpaceX builds

The company’s work spans rockets, spacecraft and a satellite network:

• Falcon 9 — its workhorse reusable rocket, whose first stage lands back on Earth to be flown again.
• Falcon Heavy — a heavy-lift version made of three Falcon 9 cores.
• Dragon — a capsule that carries cargo and astronauts to the International Space Station.
• Starship — a giant, fully reusable rocket designed for the Moon, Mars and heavy payloads. See how many engines Starship has.
• Starlink — a constellation of thousands of satellites delivering internet from orbit. See Starlink explained.

Why reusable rockets matter

For decades, rockets were thrown away after a single flight — like scrapping a plane after one trip. SpaceX’s breakthrough was landing and reflying the expensive first stage, which dramatically lowers the cost per launch. We break the numbers down in how much a SpaceX launch costs.

The goal: Mars

Musk founded SpaceX with an explicit long-term aim: to build a self-sustaining city on Mars. Starship is the vehicle meant to make that possible. Whether or not that timeline holds, the pursuit has already reshaped the space industry — pushing costs down and launch rates up to levels that seemed impossible 20 years ago.

FAQ

What does SpaceX do?

SpaceX designs and launches rockets and spacecraft. It carries satellites, cargo and astronauts to orbit, runs the Starlink internet network, and is developing Starship for missions to the Moon and Mars.

Who owns SpaceX?

SpaceX was founded and is led by Elon Musk, who is its CEO and chief engineer and holds a controlling stake. Long privately held, it went public in a record-breaking IPO in June 2026 and now trades on the Nasdaq.

Why is SpaceX important?

It made rockets reusable, which sharply lowered launch costs, and it became the world’s busiest launch provider. Its Starlink network also brought internet to places traditional providers can’t reach.

What is Starship?

Starship is SpaceX’s giant, fully reusable rocket, designed to carry large payloads and people to the Moon and Mars. It’s central to the company’s long-term goal of settling Mars.

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Spaceflight programs and company plans change over time. This explainer reflects the current landscape and is reviewed periodically.