neptune

origin of name :

the roman god of sea 
length of year :
164 earth years
position from sun :
8th
relative size:
4th biggest
unlike the other giants , some of its rings are incomplete arcs .This planet generates heat of its own and this powers its dramatic weather systems
Triton is the largest moon of the planet  Neptune, discovered on oct 10,1846,by english astronamerWilliam . It is the only large moon in theSolar System with a retrograde orbit, which is an orbit in the opposite direction to its planet's rotation

uranus

Origin of name:

Uranus, the Roman God of sky.

Moons :

27

Length of year:

84.04 Earth years

Position from Sun:

7^th

Relative Size:

3^rd  biggest

Uranus is the only planet  that is tipped on its side. It has dark rings, and its atmosphere bland with a green tinge

Uranus has five major moons: Miranda, Ariel, Umbriel,Titania, and Oberon.All large moons are relatively dark objects.The major moons of Uranus are believed to have formed in the accretion disc, which existed around Uranus for some time after its formation or resulted from the large impact suffered by Uranus

saturn

origin of name :

 saturnus,roman god of agriculture.
moons: 
57
length of year;
 29.5 earth years.
position from sun: 
6th 
relative size: 
2nd biggest

Saturn has no solid surface and is almost all hydrogen and helium. Its famous beautiful rings are made of ice and rock

Moons of Saturn: Titan

Titan, the largest moon in the solar system after Ganymede ( Jupiter’s moon). It is the only moon with a thick atmosphere, made largely of Nitrogen. In 2005, the Huygens probe photographed its mysterious surface for the first time