A set of Albert Einstein's equations have sold for a staggering £604,800 - almost eight times their estimate, APA reports citing DailyMail.
The physicist jotted down a diagram of a gravitational lens and over 30 complex calculations on three pages of paper in 1936.
The document was sold alongside a draft of his article 'Lens like action of a star by the deviation of light in the gravitational field'.
The letter had been expected to sell for £80,000 but sparked an internet bidding war between two private collectors at London-based auctioneers Christie's, driving the price up.
It is the fourth highest price ever achieved at auction for an Einstein letter.
Gravitational lensing, which is the deflection of light, is used to spot the most distant and earliest-formed galaxies.
This is said to have 'fundamental implications' for the parameters of Big Bang models.
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