A new, giant, massive ring has been discovered around Saturn- so large that a BILLION earths could fit in it! It is more than 300 Saturns wide! How could astronomers have missed it?

Well, it turns out the ring is almost invisible, that's how. While it is about 40 million kilometers across it is exceedingly thin. It is made of dust-like ice and rock particles that barely reflect any of the feeble sunlight that reaches Saturn- but the sun does heat them up. So it was the Spitzer infrared telescope that finally noticed the giant ring.