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Artwork of SpaceX's reusable rocket Starship landing or launching on the surface of Mars. Starship is designed to be the most powerful launch vehicle ever built, and it is fully reusable. When launching from Earth, the system consists of Starship itself (shown here), perched atop a booster stage called the Super Heavy. Starship by itself cannot escape Earth's gravity, which is why it needs the additional booster at launch (which is also reusable), but it can land by itself, as here, and has already done so in tests on Earth. (KEYSTONE/SCIENCE PHOTO LIBRARY/MARK GARLICK/SCIENCE PHOTO LIBRARY)