Hubble captures stunning image of massive galaxy cluster.

The Hubble Space Telescope has captured an image of a galaxy cluster located nine billion light-years away in the constellation Draco. The cluster, known as eMACS J1823.1+7822, is one of five selected for observation by Hubble astronomers to determine the strength of the "warping" effect predicted by Albert Einstein's theory of general relativity. The distortion caused by massive clusters like eMACS J1823.1+7822 can also help astronomers study mysterious dark matter, which accounts for around 85% of the mass in the universe but is invisible because it does not interact with electromagnetic radiation.