Astonishing image of the Planet Saturn eclipsing the Sun captured by NASA's Cassini spacecraft
Planet Saturn Facts
Saturn is the sixth planet from the sun and the second largest in the
It is a giant ball of gas composed mainly of hydrogen and helium with no
Saturn is around 10 times bigger than Earth with a diameter of 74,900
miles (120,540 km).
It orbits the sun at an average distance of 886 million miles (1.4 billion
Saturn has seven main separate rings around it which are made from rock
and ice particles.
Its main rings extend outwards for over 200,000 km, yet their thickness ranges from around only 5 to 15 meters.
It is believed Saturn's rings will eventually disperse or be drawn into
Winds in Saturn's upper atmosphere can reach over 1,000 miles (1,600 km)
Saturn has the lowest density of any planet in the solar system, so much
so that it would float in water.
Saturn's banded atmosphere
Saturn takes almost 30 years to make one complete orbit of the sun and rotates on its own axis every 10 hours 39 minutes compared to 24 hours on Earth, only Jupiter rotates faster.
Saturn's atmosphere is composed of 96.3% hydrogen and 3.25% helium. The remaining half percent is made up of trace elements of
ammonia, acetylene, ethane, phosphine and methane.
The temperature at Saturn's upper atmosphere average around -175C (-285F). The temperature below the clouds gets considerably hotter.
Saturn's core has a temperature of around 11,700C (21,000F).
Saturn has 62 moons, 25 of which have a diameter of at least 6 miles (10
km), the most interesting of these are
Largest Moons of Saturn
Diameter: 5150 km
Mass: 1.8 x Earth Moon
Orbit: 1.2 million km
Orbit Period: 16 days
Titan is the largest of Saturn's moons and the second largest in the entire solar system. It is also the only moon in the solar system to possess a significant atmosphere
and the only body apart from Earth with large areas of liquid on its surface.
Diameter: 1528 km
Mass: 0.03 x Earth Moon
Orbit: 850,000 km
Orbit Period: 4.5 days
Rhea is the second largest of Saturn's moons and the ninth largest in the solar system. It is mostly composed of water ice which explains its extremely low mass,
like our moon Rhea is tidally locked, meaning the same side is always facing Saturn.
Diameter: 1470 km
Mass: 0.025 x Earth Moon
Orbit: 3.6 million km
Orbit Period: 79 days
Iapetus is the third largest of Saturn's moons. Like Rhea it is mostly composed of water ice and is also tidally locked.
Iapetus is notable for its striking differences in color, one side of the moon is extremely bright while the other is darker brown.
Origin of Name
The Romans named the planet Saturnas after their god of
Life on Saturn
Scientists doubt that any form of life could exist on Saturn.
The Rings of Saturn
Natural color image of Saturn's rings
The rings of Saturn are the most spectacular sight in the solar system and have fascinated astronomers for centuries. Science has not yet discovered how they formed but it is believed they are made up of debris from an asteroid or comet colliding with one of Saturn’s moons. They are mostly composed of ice with smaller amounts of dust and other particles.
They were named alphabetically in the order they were discovered and differ in thickness and width. Working outward from the planet the main innermost rings are D,C.B,A and F. The B ring is the biggest and brightest with an estimated thickness of around 10 meters and a width of 16,000 miles (25,000 km). There are also fainter outer rings G and E and the most recently discovered Phoebe ring, which lies 8 million miles (15 million km) from the planet. It is thought to be composed of debris from one of Saturn’s moons, Phoebe.
There are also gaps in the rings, the biggest of which is called the Cassini Division, named after the Italian astronomer Giovanni Cassini, the gap is almost 5,000 miles (8,000 km) wide. It was through one of these gaps that the Cassini-Huygens spacecraft had to navigate as it approached Saturn. Scientists at NASA held their breath but fortunately it managed to pass through successfully and continue its mission.
Missions to Saturn
Launch: October 1997 Arrival: July 2004 Agency: NASA/ESA (Europe) Summary: Cassini-Huygens is still in orbit around Saturn as part of its extended mission to study the planet and its moons. The craft sends back new images every day
as well as studying the space environment of the Saturnian System.
Voyager 1 and 2
Launch: August-September 1977 Arrival: August 1980-June 1981 Agency: NASA Summary: Voyager 1 and 2 made successful flybys of Saturn discovering the intricate structure of the ring system as well as sending back new information about its atmosphere and magnetic field.
Between them they took around 32,000 images of the planet.
Launch: April 1973 Arrival: September 1979 Agency: NASA Summary: Made a successful flyby of Saturn studying its magnetic field, atmosphere and sending back pictures of the planet.
Moons orbiting Saturn
Planet Saturn Statistics
Diameter: 74,900 miles (120,540 km) Average Distance from Sun: 886 million miles (1.4 billion km) Orbital Period: 29.4 years Rotation Period: 10.66 hours Maximum Temperatures: 11,700C (21,000F) (Core) Minimum Temperatures: -178C (-288F) (Cloud Tops) Gravity: 10.4 m/s2(1.06 x Earth's Gravity) Density: 0.7 g/cm3(12.7% Earth's Density) Mass: 5.6851 x 1026 kg (95 x Earth's Mass) Volume: 8.2713 x 1014 km3(764 x Earth's Volume) Atmosphere:
0.01% Hydrogen deuteride,