wunder beta🪂 Seven minutes: how a rover lands on Mars
Nobody flies a Mars landing. On 18 February 2021 the room at JPL cheered eleven minutes after it was already over. Peak heating hits about 1,300 °C seventy-five seconds in. The parachute opens at 1,512 kph and is thrown away anyway. Four of
What you’ll learn
- Seven minutes, no pilotExplain why the radio delay forces a Mars landing to be autonomous, and why the target is an ellipse rather than a point.The landing is decided years in advance because nobody can intervene: by the time Earth hears that entry has begun, it is already over.
- The atmosphere takes the first hitTrace how the aeroshell, the guided lifting entry and the parachute each remove energy, and where each one reaches its limit.Mars's thin air makes braking possible and insufficient at once, so the vehicle stacks a sacrificial heat shield, a steered entry and a supersonic parachute.
- Eyes open, rockets onDescribe how radar, terrain-relative navigation, powered descent and the sky crane put the rover on its wheels.Once the heat shield falls away the spacecraft can measure instead of assume — and it lands within metres of a spot it chose for itself.
- What the landing throws awayConnect the discarded hardware and the recorded descent to what could, and could not, be measured about the landing.Success is a field of deliberate wreckage around one working rover, watched closely from orbit and missed entirely from the ground.
Questions this course answers
Why can a Mars landing not be flown from Earth?
On 18 February 2021 the one-way light time was 11 minutes 22 seconds. Perseverance touched down at 20:44 UTC; Earth found out at 20:55.
What is a landing ellipse?
Curiosity's Gale Crater target was about 20 by 7 km; Perseverance's Jezero target was 7.7 by 6.6 km.
What does an ablative heat shield actually do with the heat?
The outside of Perseverance's shield reached about 1,300 °C roughly 75 seconds after entry. The tiles are meant to be ruined.
How does a blunt capsule with no wings steer during entry?
Curiosity's aeroshell flew at a lift-to-drag ratio of about 0.24, produced by an offset centre of gravity. Six balance masses are thrown off roughly fifteen seconds before parachute deploy to remove the offset again.
Why is the parachute discarded rather than used all the way down?
Even a 21.5-metre canopy leaves the vehicle falling too fast in this atmosphere. The chute buys altitude and time, then has to leave.
What does Terrain-Relative Navigation give the spacecraft that radar cannot?
Radar measures altitude and velocity. The Lander Vision System supplied position — under 40 metres relative to an onboard map, in less than ten seconds.
Grounded in trusted sources
- NASA Jet Propulsion Laboratory, Mars 2020 Perseverance Landing Press Kit — Mission Overview and Quick Facts (2021)
- NASA Jet Propulsion Laboratory, Mars 2020 Perseverance Landing Press Kit — Getting to Mars: the spacecraft (2021)
- NASA Science, How We Land on Mars (mission timeline)
- D. W. Way, R. W. Powell, A. Chen, A. D. Steltzner, A. M. San Martin, P. D. Burkhart & G. F. Mendeck, Mars Science Laboratory: Entry, Descent, and Landing System Performance, IEEE Aerospace Conference paper 1467 (NASA Technical Reports Server 20090007730 and 20070016022)
- JPL Robotics, Terrain Relative Navigation — Mars 2020 flight project, NASA Jet Propulsion Laboratory
- NASA Science, Terrain Relative Navigation: Landing Between the Hazards (technology highlights)
- NASA Jet Propulsion Laboratory news release, 22 February 2021: Mars Perseverance Rover Provides Front-Row Seat to Landing, First Audio Recording of Red Planet
- B. Fernando et al., Seismic constraints from a Mars impact experiment using InSight and Perseverance, Nature Astronomy 6, 59-64 (2022)
Every Wunder lesson is built from real, reputable sources — never invented.
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