NASA's Cassini spacecraft has documented the formation of a small
icy object within the rings of Saturn that may be a new moon, and may also provide clues to the formation of the planet's known moons.
While NASA's Wide - field Infrared Survey Explorer (WISE) failed to the tell - tale warmth of gas giants like Saturn
within 10,000 AUs and larger than Jupiter
objects out to 26,000 AUs (NASA / JPL news release), an
icy «super-Earth», would have been too cold and faint for WISE to detect — even if the hypothesized planet has a small internal heat source and absorbs some sunlight.