NASA has shared an animation that attempts to put the colossal size of supermassive black holes into perspective. There are more than 100 of these mammoth black holes, such as Sagittarius A* (Sgr A*) at the center of our very own Milky Way, confirmed by direct measurements.

While there are smaller black holes that exist throughout galaxies,

Source: Hot Hardware – Awesome NASA Animation Sizes Up Monstrous Black Holes And It’s Mesmerizing