Zoom into some of the Hubble Space Telescope’s most iconic images, from the Cosmic Reef (shown) to the Whirlpool Galaxy: https://esahubble.org/images/archive/zoomable/ Which experience is your favorite? | Hubble Space Telescope

The three main types of galaxies are elliptical, spiral, and irregular, according to NASA's Hubble Space Telescope’s namesake, astronomer Edwin Hubble! Watch this “field guide” to galaxies to learn about these collections of stars, planets, gas, dust, and dark matter held together by gravity. | NASA’s Goddard Space Flight Center