October 13, 2016
Space used to be surprisingly crowded. The observable universe contains a whopping two trillion galaxies, making it 10 times as packed as we previously thought.
Since the Hubble Space Telescope started observing the deep sky, we’ve used its images to estimate that the universe we can see contains around 100 billion galaxies. But now, a team of astronomers led by Christopher Conselice at the University of Nottingham has generated 3D images of deep space by combining images from telescopes around the world, including Hubble.