I am not aware of any. It does not go through "crescent" and "half" phases like our moon, because it is beyond earth's orbit, so it cannot have (from our view) "phases". And in and of itself, Neptune is one of the most featureless and uninteresting planets to view, much like Uranus.
8 phases.
It takes the moon about one month to go through it's 8 phases.
no Mars does not go through phases as seen from earth.
The changes in shape that the moon goes through are called phases.
6
It takes one month for the Moon to go through all of its phases one time.
every 29.53 days
Yes
Are sisters won't tell us
Yes.
every four years
29.5 days