Why the US is Struggling to Land on the Moon — Real Engineering

Quick Overview

The US is struggling to land on the Moon due to the inherent difficulties of lunar descent, recent private mission failures, and the high cost of human-crewed missions. Current efforts focus on developing autonomous landing technologies and establishing a robust communication and navigation infrastructure around the Moon through commercial partnerships, aiming to make future human missions safer and more reliable.

Key Points: Two recent US private lunar landing attempts failed in early 2024, with Astrobotic's Peregrine Lander experiencing a propellant leak and Intuitive Machines' Nova-C lander tipping over on impact. The Nova-C lander's visual guidance system failed to navigate around a rock, causing a landing leg to break and the lander to tip onto its side. NASA's Commercial Lunar Payload Services (CLPS) initiative funds private companies to develop lunar landing technologies, with each mission receiving around $100 million. Modern lunar missions are uncrewed due to the high cost of sending humans, with payloads costing approximately $1 million per kilogram to reach the Moon. Autonomous navigation systems rely on detailed 3D maps of the Moon from the Lunar Reconnaissance Orbiter, but can be impaired by dust plumes at low altitudes. Lander design is crucial for stability; Firefly's Blue Ghost lander uses a lower center of gravity with side-by-side propellant tanks, unlike Intuitive Machines' taller, stacked design. China has a strategic advantage with lunar relay satellites providing continuous communication and navigation for far-side missions, a capability the US and Europe currently lack.

Context: Landing on the Moon is an incredibly complex endeavor, as recent private American lunar landing attempts have demonstrated. Since the Apollo 17 mission in 1972, the United States has not successfully landed a spacecraft on the Moon until recently, with two private missions failing in early 2024. These missions are part of NASA's Commercial Lunar Payload Services (CLPS) initiative, which aims to develop technologies and infrastructure for future human missions to the Moon, such as the Artemis program. The challenges range from precise navigation in an unforgiving environment to managing the complex physics of spacecraft descent and ensuring reliable communication over vast distances.