Shooting Star and Milky Way over Goblin Valley National Park in Green River, Utah. Photo Credit: Bret Webster The Milky Way is seen in the distance over a collection of hoodoos, tall spiny columns of rock which protrude from the bottom of arid basins.
This panel of images represents a study of 72 colliding galaxy clusters conducted by a team of astronomers using NASA's Chandra X-ray Observatory and Hubble Space Telescope. The research sets new limits on how dark matter - the mysterious substance that makes up most of the matter in the Universe - interacts with itself, as reported in the press release. This information could help scientists narrow down the possibilities of what dark matter may be.