Starship meets the one-tonne landing ceiling
Nothing heavier than Perseverance's 1,025 kg has ever been set down on Mars. Starship proposes roughly a hundred tonnes, and it has not yet reached orbit.
The heaviest object anyone has ever landed on Mars is the Perseverance rover, at 1,025 kilograms. Before it, Curiosity at 899 kg. Before those, nothing above about 600 kg. Every one of them came down using descent technology traceable to Viking in 1976: a blunt aeroshell, a supersonic disk-gap-band parachute, then rockets or a sky crane for the last few hundred metres.
In 2006 Robert Braun and Rob Manning named the wall this architecture runs into. Mars has an atmosphere about 1 percent as dense as Earth's — thick enough to heat a vehicle to thousands of degrees on entry, far too thin to slow it down in time. Above roughly one tonne of landed mass the vehicle is still travelling too fast when it gets too low for a parachute to help; they called it the supersonic transition problem. Their arithmetic is the whole story of this era. Every robotic system landed to that point had put down under 0.6 tonnes; engineers were struggling to get Curiosity to 0.8; and crewed plans were already drawn around 40 to 80 tonnes set down within tens of metres of pre-positioned cargo.
SpaceX's answer is to skip the parachute entirely and land on engines, the way Falcon 9 boosters do, scaled up by an order of magnitude and carried out at Mars with no GPS, no test range and a twelve-minute comms delay. Starship's published cargo page now offers Mars delivery no earlier than 2028 at $100 million per tonne. Elon Musk's stated dates have moved from 2018 to 2022 to 2026 to that, and in May 2025 he put the odds of making the 2026 window at "50-50" himself.
So the ceiling is a hundredfold jump, not a marginal one, and it has to be cleared on the first try at a planet where no one gets a second look at what went wrong. Nothing about the descent can be rehearsed at Earth: the atmosphere is the wrong density, the approach speed is wrong, and the only full-scale test is the landing itself. What can be rehearsed — reaching orbit, refuelling there — has not been. As of September 2026 no Starship has completed a single orbit of the Earth.