Ancient Star Maps Revealed by X-Rays After 1,500 Years

Cutting-edge technology unlocks secrets of the past, reshaping our understanding of scientific progress.

Jan. 30, 2026 at 1:55pm

Got story updates? Submit your updates here. ›

Researchers at SLAC National Accelerator Laboratory have used advanced X-ray technology to uncover ancient star maps hidden within a 1,500-year-old manuscript, the Codex Climaci Rescriptus. This discovery is not just a historical triumph, but also a powerful demonstration of how scientific techniques are unlocking secrets from the past and reshaping our understanding of the development of scientific thought.

Why it matters

The rediscovery of Hipparchus' star catalog challenges long-held assumptions about the originality of Ptolemy's work, revealing a more nuanced picture of scientific progress as a collaborative, iterative process. This has implications for how we approach modern scientific research, emphasizing the importance of building upon existing knowledge, acknowledging sources, and embracing open collaboration.

The details

The Codex Climaci Rescriptus is a palimpsest, where original text was scraped off and overwritten. Traditional paleographic methods have been limited in deciphering such complex historical texts. However, the emergence of 'Paleography 2.0' driven by technologies like multi-spectral imaging, X-ray fluorescence, and advanced computational algorithms is revolutionizing the field. These techniques have also been used to recover lost works of Archimedes, revealing early foundations of calculus centuries before Newton and Leibniz.

  • The recent rediscovery of the ancient star maps occurred in 2026.

The players

SLAC National Accelerator Laboratory

A U.S. Department of Energy national laboratory that specializes in particle and accelerator physics, as well as interdisciplinary research involving advanced imaging and analysis techniques.

Victor Gysembergh

A historian of science at CNRS (National Center for Scientific Research) in Paris, who commented on the implications of the Hipparchus discovery.

Codex Climaci Rescriptus

A 1,500-year-old palimpsest manuscript that contained hidden star maps, which were recently uncovered using X-ray technology.

Archimedes Palimpsest

A project at the University of Rochester that utilized advanced imaging techniques to recover lost works of the ancient Greek mathematician Archimedes.

Digital Hamlet

A project that uses imaging to reveal underdrawings in Shakespeare's First Folio, making these discoveries accessible to a wider audience.

Got photos? Submit your photos here. ›

What they’re saying

“That's not plagiarism, that's science.”

— Victor Gysembergh, Historian of science at CNRS

What’s next

Researchers at SLAC and other institutions are expected to continue exploring the potential of advanced imaging and analysis techniques to uncover more hidden secrets from ancient texts and artifacts. Improved X-ray sources, AI-powered image processing, hyperspectral imaging, and integration with 3D modeling are some of the areas of ongoing development that could further enhance these efforts.

The takeaway

The rediscovery of ancient star maps through cutting-edge X-ray technology demonstrates the power of interdisciplinary collaboration and the democratization of access to historical knowledge. This breakthrough not only reshapes our understanding of the development of scientific thought but also serves as a reminder that even groundbreaking innovations often have roots in earlier, sometimes forgotten, work.