They Proved Einstein Right; Now They've Won The 2017 Physics Nobel Prize03:07

Three colleagues, Rainer Weiss, Barry C. Barish, and Kip S. Thorne, have won the 2017 Nobel Prize in physics, for their contributions to work that led to the observation of gravitational waves — something that happened for the first time in 2015.

Speaking of decades of trial and error that preceded their discovery, Weiss said Tuesday, "It's very, very exciting that it worked out in the end."

Weiss spoke by phone to the Royal Swedish Academy of Sciences, roughly one hour after he had been woken up by Secretary General Göran K. Hansson.

Thorne spoke to NPR's Joe Palca about his reaction to the prize:

"My reaction was just one of profound satisfaction. That things had worked out in essentially precisely the way that I had expected. And that I had put my own energies in the right directions to help make it happen."

Thorne said he's pleased to represent "this superb team that's pulled this off."

For years, physicists tried to find ways to detect ripples in the fabric of space-time. In the 1980s, Weiss and Thorne — along with Ronald Drever, who died this past March — proposed building a facility that could detect the gravitational waves that had been predicted by Albert Einstein in his General Theory of Relativity.

In 2016 — 100 years after Einstein published his idea — the physicists published a paper detailing how they had detected gravitational waves rippling from the collision and merging of two black holes — each with roughly 30 times the mass of the sun.

The milestone event made Weiss, Thorne and Drever celebrities and earned them a raft of awards, even as Drever's health was failing last year. Barish's involvement began in the early 1990s, first as an investigator and then, in 1997, as its director during pivotal times for the project.

The facility the physicists built to detect that event is the Laser Interferometer Gravitational-Wave Observatory (LIGO), which operates two huge detectors in Livingston, La., and Hanford, Wash.

NPR's Geoff Brumfiel explained how the LIGO facilities work:

"Each detector looks like a big L, made up of two tunnels 2.5 miles long. It's designed so that if a gravitational wave passes by, it will stretch space along one direction of the tunnel and squish space along the direction of the other. The stretching and squishing changes the tunnels' lengths by a tiny amount, and that change can be detected by lasers."

LIGO is run by the California Institute of Technology and the Massachusetts Institute of Technology; it's funded by the National Science Foundation. The LIGO Scientific Collaboration now includes more than 100 institutions and 18 countries.

As for the future of gravitational wave science, Barish told Joe Palca on Tuesday:

"I can't imagine that now that we have another way to look at the universe that there isn't going to be some enormous surprises. Things that have nothing to do with what we already know."

Janna Levin, author of a book about the physicists' life work, wrote about them around the time of last year's Nobels, when it was suspected they might win. The LIGO project, she said, had created a community "dedicated to maximizing the impact of this new device, to capturing the soundtrack to accompany 'the silent movie of our universe.' "