Secrets Of Ancient Concrete, And... Data Centers In Space? - Science Friday Recap

Podcast: Science Friday

Published: 2026-01-14

Duration: 18 minutes

Guests: Dr. Admir Masic, Dr. Benjamin Lee

Summary

Scientists have discovered insights into ancient Roman concrete's durability and explore the feasibility of moving data centers to space.

What Happened

Scientists recently unearthed a construction site in Pompeii, preserved by volcanic ash, providing clues to the composition and techniques used in making ancient Roman concrete. Dr. Admir Masic from MIT discusses how this discovery supports the theory of 'hot mixing,' where raw materials were mixed dry before adding water, allowing the concrete to self-heal over time. This technique could revolutionize modern concrete, making it more durable by mimicking ancient methods of mixing volcanic ash and lime.

The episode transitions to discussing the possibility of moving data centers to space, as explained by Dr. Benjamin Lee from the University of Pennsylvania. The main attraction is the abundance of solar energy available in space, which is not subject to the limitations of Earth's night cycles. This could provide a continuous power source for the energy-intensive operations of data centers.

Dr. Lee outlines the challenges of such a venture, including the immense cost and logistics of launching and maintaining large structures in orbit. He also highlights space-specific issues like radiative cooling, which requires additional surface area to dissipate heat, complicating the infrastructure further.

Communication with orbital data centers is another hurdle, as the current technology may not efficiently handle the massive data transfer required for training AI models in space. These models need large datasets, and moving this data to space is currently impractical.

Despite the challenges, Dr. Lee suggests that there are opportunities for preliminary research into smaller-scale compute functions for satellites in space, which could pave the way for more significant infrastructure later.

The conversation also touches on optimizing Earth's data centers, suggesting that improving efficiency in energy consumption and data processing could be a more immediate solution compared to the ambitious goal of moving operations to space.

The discussion concludes with an acknowledgment of the potential for future technological advancements that could make space-based data centers a more feasible option, though it remains a long-term vision.

Key Insights

• Ancient Roman concrete used a 'hot mixing' technique, where raw materials like volcanic ash and lime were mixed dry before adding water, allowing the concrete to self-heal over time, potentially increasing its durability.
• Space-based data centers could utilize the abundance of solar energy available in space, providing a continuous power source not limited by Earth's day-night cycle, which is advantageous for energy-intensive operations.
• Challenges for orbital data centers include the high costs and logistics of launching and maintaining large structures, as well as the need for additional surface area for radiative cooling to dissipate heat.
• Current technology struggles with the massive data transfer required for training AI models in space, making it impractical to move large datasets to orbital data centers, though smaller-scale compute functions for satellites are being considered for preliminary research.