Cosmic Voids: Unveiling the Universe's Expansion History with NASA's Nancy Grace Roman Space Telescope

5 min read Lee esta nota de prensa en españolaquí. Our universe is filled with galaxies, in all directions as far as our instruments can see. Some researchers estimate that there are as many astwo trillion galaxiesin the observable universe. At first glance, these galaxies might appear to be randomly scattered across space, but they’re not. Careful mapping has shown that they are distributed across the surfaces of giant cosmic “bubbles” up to several hundred million light-years across. Inside these bubbles, few galaxies are found, so those regions are called cosmic voids. NASA’s Nancy Grace Roman Space Telescope will allow us to measure these voids with new precision, which can tell us about the history of the universe’s expansion. To view this video please enable JavaScript, and consider upgrading to a web browser thatsupports HTML5 video