The Universe

https://www.nasa.gov/sites/default/files/styles/full_width/public/thumbnails/image/spitzer20091006-16-11.jpg?itok=OFP1nKEL "Saturn's stunning ring system has been photographed extensively, but those portraits have not revealed the planet's largest ring. The wispy structure is a diffuse collection of particles that orbits Saturn much farther from the planet than any of the other known rings. The ring starts about six million kilometers (3.7 million miles) away from the planet. It is about 170 times wider than the diameter of Saturn, and about 20 times thicker than the diameter of the planet. If we could see the ring with our eyes, it would be twice the size of the full Moon in the sky. One of Saturn's farthest moons, Phoebe, circles within the ring and is likely the source of its material. The relatively small numbers of particles in the ring don't reflect much visible light, especially out at Saturn's orbit where sunlight is weak, which is why it remained hidden for so long. Spitzer was able to detect the glow of cool dust in the ring, which has a temperature of about minus 316 degrees Fahrenheit or minus 193 degrees Celsius, which is 80 Kelvin."