A Finnish astrophysicist proposes a human colony orbiting Ceres, the asteroid belt's largest body. He argues this offers a more practical path than Mars colonization.
As U.S. astronauts prepare for the Moon's return through NASA's Artemis program, agencies and private firms like SpaceX target Mars, with crewed missions planned for the 2030s.
Mars appeals due to its Earth-like proximity, 24-hour day-night cycle, and CO2 atmosphere. Yet some experts contend planetary surface colonies pose unnecessary risks.
In a recent arXiv paper, Pekka Janhunen from the Finnish Meteorological Institute outlines a visionary alternative: an orbital mega-station around dwarf planet Ceres. Fans of The Expanse will recognize the concept.
Discovered in 1801 by Giuseppe Piazzi, Ceres (950 km diameter) is the asteroid belt's dominant object between Mars and Jupiter. NASA's Dawn mission in 2015 revealed potential subsurface oceans of liquid, salty water, sparking scientific interest.
Janhunen envisions a mega-station of thousands of interconnected cylindrical habitats forming a disk in Ceres orbit, echoing Gerard K. O'Neill's concepts from The High Frontier.
Each cylinder, 10 km long and 1 km radius, could house over 50,000 people, with an artificial atmosphere and Earth-like gravity from rotation every 66 seconds.
Space elevators would ferry raw materials from Ceres to orbit.
Two massive 45-degree mirrors would channel sunlight for agriculture in 1.5-meter soil beds, while urban zones use artificial lighting for a natural day-night rhythm.
Ceres matches Mars' Earth distance for feasible travel and boasts nitrogen for atmospheres (Earth's is 79% nitrogen). Janhunen optimistically predicts viability in 20-30 years.
Planetary habitability expert Manasvi Lingam of Florida Tech calls it a "plausible alternative" to Mars or Moon surfaces but flags gaps.
First, essential elements beyond nitrogen—like phosphorus for DNA, RNA, ATP, and plant growth, plus oxygen—are unaddressed.
Second, mining Ceres demands advanced autonomous vehicles to extract resources from rock, technology not yet ready. NASA's recent InSight 'mole' failure on Mars underscores these hurdles.
Intriguing on paper, but significant engineering advances remain.
