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🚀 How does a spacecraft slow down to land?

Deorbit burns, atmospheric drag and heat shields, parachutes, then engines or soft-landing systems.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Orbital speed is the first problemExplain why deorbit burns and destination atmosphere dictate the braking toolkit.Orbital speed must be removed deliberately. Earth uses air heavily; the Moon uses engines; Mars mixes both.
Atmosphere as a brake — and a furnaceDescribe entry heating, guidance, and parachute timing after hypersonic deceleration.Plasma and heat shields dump energy; lift and bank steer the profile; parachutes open only when air allows.
Final meters: engines, legs, and precisionConnect powered landing, aerobraking, and the overall EDL energy budget.Final velocity goes to zero with engines, legs, or soft-landing systems. EDL stacks tools to match the world.

Questions this course answers

Why do many Earth-return missions fire a deorbit burn before entry?

A retrograde burn reduces orbital energy so the path dips into the atmosphere under control rather than remaining in stable orbit.

Match each landing tool to its main job

Different phases use different tools: thrusters set up entry, shields and drag handle plasma speeds, chutes and engines finish the job.

Why do lunar landers rely so heavily on rocket engines to slow down?

Without air, heat shields and parachutes cannot shed kinetic energy; engines provide the only substantial continuous braking force to touchdown.

Grounded in trusted sources

NASA Entry, Descent, and Landing (EDL) public mission explainers (Mars and Earth return)
NASA Apollo lunar descent and modern commercial crew reentry overviews
ESA reentry and heat-shield technology education pages
SpaceX and NASA public descriptions of propulsive landing and parachute recovery profiles

Every Wunder lesson is built from real, reputable sources — never invented.

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