Galaxies on Instagram: "NASA made this simulation of a black hole devouring a star. Supermassive black holes are objects millions to billions times the sun’s mass that lurk in the hearts of most galaxies. They lay quietly until victims, such as stars, wander close enough to get shredded apart by their extraordinarily powerful gravitational pull. Astronomers say supermassive black holes rip apart stars very rarely, maybe just once every 10,000 years per galaxy."