How a bouncing lander unlocked the chemical secrets of our early solar system
In short: When the Philae probe touched down on Comet 67P/Churyumov-Gerasimenko, it did not stay where intended. Instead, it bounced to a dark, unplanned location. Yet, from this unexpected landing, scientists discovered the ancient molecular building blocks of our solar system.
The Rosetta mission, led by the European Space Agency, achieved a historic milestone in August 2014 by becoming the first spacecraft to orbit a comet. The mission architecture relied on two components: the Rosetta orbiter and the 100-kilogram Philae lander. While the orbiter's mission was extended until September 2016, the lander's fate was more precarious. On November 12, 2014, Philae successfully reached the surface of Comet 67P/Churyumov-Gerasimenko, but the landing was far from perfect. The mission's primary objective was to conduct a detailed, two-year study of the comet as it traveled around the Sun. A variety of collaborators, including research centres based in the UK, Italy, Ireland, Hungary, France, Finland, and Austria, backed this bold scientific project.
Designed by a European consortium led by the German Aerospace Research Institute (DLR), the lander was equipped with harpoons and ice screws intended to anchor it to the comet. However, the mechanism failed to secure the craft, causing Philae to bounce to a new, less illuminated site than the mission planners had selected. Despite this setback, the lander's nine experiments, weighing approximately 21 kilograms, provided invaluable data before the craft entered hibernation. The lander's physical structure featured a polygonal sandwich design constructed from carbon fibre, with several subsystems protected by a solar cell hood. To communicate with Earth, the craft utilized an antenna to relay its findings back to the orbiter.
The scientific payoff was profound. By employing the COSAC device, which underwent vacuum chamber trials at the Max Planck Institute for Solar System Research, scientists identified more than twelve molecules comprised of oxygen, nitrogen, hydrogen, and carbon inside the landing-induced dust cloud. Furthermore, the ROLIS camera provided detailed views of the comet's surface structure. These findings, including the presence of carbon-rich molecules, offer a window into the chemical environment present during the early formation of our solar system.
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Sources
- Summary by Intellect · source: Rosetta lander science
- Also: Rosetta-Philae - NASA Science
- Also: The Rosetta lander
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