After a century, scientists have finally proven one of Einstein’s theories, thanks to gold and platinum.

In November 1915, Einstein presented his general theory of relativity, known as the spacetime continuum, which introduced a new understanding of one of the main forces in nature known as gravity.

The European Space Agency (ESA) announced the detection of gravitational waves in space on Feb. 11, as theorized by the great physicist Albert Einstein 100 years ago.

“Gravitational waves are elusive no more: an exciting breakthrough that has been 100 years in the making,” ESA’s press release stated.

The LISA Pathfinder spacecraft, which is made up of g0ld and platinum cubes, was launched in December with the mission to study the gravitational universe.

“LISA Pathfinder will monitor…two identical gold-platinum cubes measuring 46 mm on each side and weighing 1.96kg each – as they free fall through space,” the agency said.

At current prices, that amounts to $152,000 worth of gold and platinum, according to Kitco.