In their paper published in the journal Nature, the team describes how they studied the ring using an infrared telescope and what they believe caused its immense size to come about. “I was giving talks saying Saturn has a giant invisible ring, which makes you sound just perfectly crazy,” said lead author Douglas Hamilton, a planetary scientist at the University of Maryland, College Park. Back in 2009, a team of researchers working with NASA's infrared Spitzer Space Telescope discovered that there was an outer ring circling Saturn that had not been known to exist—made mostly of extremely tiny dark dust particles, the ring was difficult to see. “If that material was coming inward and coating the face of Iapetus, then maybe we could see the ring,” Hamilton said, and the team started searching. “Usually those things don’t pay off, but this one did.” 
 
 At the time, they estimated that the ring stretched from 4.8 million to 7.76 million miles, though with Spitzer's relatively narrow field of view, they couldn't say how thick it really was. Those pictures, the team reports, suggest the ring is actually over 270 times the radius of Saturn, which mean it stretches from almost four million miles from the planet to just over ten million miles, making it approximately ten times the size of the E ring, until this new discovery, Saturn's largest ring. While the Phoebe ring is enormous, the particles within are surprisingly tiny – the scientists estimate that the vast majority of them, roughly 90%, are smaller than the size of a soccer ball.
– About six years ago, scientists discovered a huge ring around Saturn that also happened to be invisible to the naked eye. Now, they've learned that it's much bigger than they thought, and their theory on how it came to be might change some thinking about planetary rings and moons. Scientists previously estimated the ring to be about 200 times the radius of Saturn, but now they say it's 30% larger, or about 270 times the radius, they write in Nature. It stretches more than 10 million miles, which a post at Phys.org puts into perspective: "If Saturn were merely the size of a basketball, this new outer ring would extend nearly two thirds the length of a football field away from it." Or as lead author Douglas Hamilton puts it in the Los Angeles Times: “It is 10 to 20 times larger than the second-biggest ring, so this thing is absolutely gargantuan.” Researchers also found that the ring is made of up surprisingly small particles, with only about 10% of them larger than a soccer ball. They suspect the material, which is quite spread out within the ring, comes from the Saturn moon Phoebe, but it was previously believed that debris ejected at such a distance would form a moon rather than a ring. "Now it appears such theories will have to be rethought," says the Phys.org post. The ring can be detected only in infrared wavelengths. Based on all this, it's possible that Jupiter, Uranus, and Neptune have similar rings, reports Wired. “Maybe ring isn’t even the right word anymore," says Hamilton, "Maybe we should call them clouds. Those are much harder to detect and convince yourself that they’re real.” (Another of Saturn's moons might be able to support life.)