* Blue Color: Neptune is known for its striking blue color, which comes from the presence of methane in its atmosphere. Methane absorbs red light, making the planet appear blue.

* Thin Rings: In 2005, NASA's Voyager 2 spacecraft revealed the existence of five faint rings around Neptune. These rings are very thin and composed of dust particles.

It's important to note that Neptune's rings were discovered long before 2005. However, Voyager 2 provided the first detailed images and information about their structure.