"neptune"

The celestial event consists of six planets -- Venus, Jupiter, Saturn, Mars, Neptune, and Uranus to be lined up in a row across the sky

This event, called the “Parade of Planets,” happens when several planets appear to line up together in the sky, even though they are far apart in the space.

The Kuiper Belt is a massive ring composed of interstellar objects such as dwarf planets, asteroids, carbon masses and icy volatile elements like methane and ammonia.

On Neptune, a dark spot was first discovered by NASA's Voyager 2 in 1989, before disappearing a few years later