A manuscript with calculations made, theory of relativity, by Albert Einstein has sold at auction for €11m (£9.7m, $13m).

The theory, published in 1915, transformed humankind’s understanding of space, time, and gravity.

The manuscript of calculations was penned between 1913 and 1914 by Einstein and his Swiss colleague Michele Besso, who kept hold of the document.

“Einstein is someone who kept very few notes, so the mere fact the manuscript survived and made its way to us already makes it extraordinary,” Vincent Belloy, an expert at the auction house said.

Einstein’s theory of relativity shed light on the birth of the universe, planetary orbits, and black holes.

However, the buyer of the 54-page paper has not been revealed.

Last May a letter written by Einstein containing the theory’s most famous equation, E=mc², sold for more than $1.2m (£897,000).