Among the Hubble Space Telescope’s most iconic images are jaw-dropping “deep field” views of the universe, images showing thousands of galaxies strewn across time and space that illustrate the rapid evolution of the cosmos in the wake of the Big Bang birth of time and space. This “eXtreme Deep Field” view is no exception.
Astronomers using data from the NASA/ESA Hubble Space Telescope and other observatories have performed an accurate census of the number of galaxies in the universe. The researchers came to the surprising conclusion that the observable universe contains at least two trillion galaxies. The results also help solve an ancient astronomical paradox — why is the sky dark at night?