<P> While in the neighborhood of Neptune , Voyager 2 discovered the `` Great Dark Spot '' , which has since disappeared , according to observations by the Hubble Space Telescope . Originally thought to be a large cloud itself , the `` Great Dark Spot '' was later hypothesized to be a hole in the visible cloud deck of Neptune . </P>
<P> While in the neighborhood of Neptune , Voyager 2 discovered the `` Great Dark Spot '' , which has since disappeared , according to observations by the Hubble Space Telescope . Originally thought to be a large cloud itself , the `` Great Dark Spot '' was later hypothesized to be a hole in the visible cloud deck of Neptune . </P>
what did the voyager 2 discover about neptune
what did the voyager 2 discover about neptune
the `` Great Dark Spot ''
the `` Great Dark Spot ''