 So what we found is the same star blowing up four different times and the way we've seen this is that Foreground Galaxy actually a massive cluster of galaxies is acting like a magnifying lens Creating four different images of the same exploding object the exploding object We think is a special type of exploding star called a type 1a supernova and these are famous for Brian Schmidt's discovery of accelerating Universe and we can use these to measure the properties of the universe So if you imagine you have a train where you actually have four trains and they leave and they leave at the same time But some goes over hills some goes through the valleys or around a mountain So they're taking different paths to get to the same destination This is quite a unique objects We're able to understand and study three entirely different huge questions all with the same set We can under figure out and test what dark matter is and how it behaves what dark energy is the stuff That's causing the universe to accelerate and actually the properties of gravity itself Through our models. We actually know that this should have appeared 15 years ago Which we'll never see because we missed it, but it will actually occur in one to four years So if we look at the same rough area, we'll get four more of the same star blowing up So we know it's going to be one of the most distant objects ever discovered But it's so far away that one night So one whole night staring at the same object on the largest telescope in the world right now Didn't actually even detect it. Luckily, we have the Hubble Space Telescope, which is a powerful telescope Using a galaxy cluster to do this magnification Really, maybe the next generation of telescopes like the giant Magellan telescope will be able to see this This discovery was entirely by accident So astronomers have spent decades of effort trying to find one of these objects and so far no luck and For an entirely different project Pat Kelly who was the lead author of this discovery Was looking through a set of images that were just recently taken with the Hubble Space Telescope and found this really weird thing Who said well, what's this and after a little bit closer examination realized This was the thing that astronomers have been spinning sometimes their whole careers trying to find and we just found it by accident