Reference ID: #19996 Event horizon Event Horizon: A boundary in spacetime beyond which events cannot affect an observer, beyond which light and other signals cannot reach. Standard Purchase £1.79 Subscribe & Save FREE with a subscription 0Dimensions 1434 X 2560pxFile Type JPGCategories: Backgrounds Sci-FiDownloads 1Tags astronomy astrophysics black hole dark matter galaxies gravity light space stars universe Created by Dave Not quite what you need? Commission an image or Generate your own