SATURN History The rings of Saturn was first

SATURN

History • The rings of Saturn was first observed by Galileo Galilei in 1610 • Described Saturn as having "ears. " • In 1612 the plane of the rings was leaning directly at the Earth and the rings appeared to disappear, and then in 1613 they reappeared again, further puzzling Galileo.

History Continuation • The riddle of the rings was not solved until 1655 by Christiaan Huygens, using a telescope much more powerful than the ones available to Galileo in his time. • In 1675 Giovanni Dominique Cassini gritty that Saturn's ring was really poised of multiple smaller rings with gaps between them; the prime of these gaps was later named the Cassini Division.

SATURN • The sixth planet from the Sun. • The second largest planet in the Solar System • Saturn has large rings consisting of mostly ice particles with a smaller amount of rocky debris. • Named after the Roman titan, Saturnus(Kronos in Greek)

Revolution Period ` 29. 46 years (10752. 9 days) Rotation Period 0. 43 days Rotaional Velocity: 37, 004. 9 km/hr

Length of Day Length of a Year 10 hours, 39 minutes 29. 5 Earth years in Earth time

SATURN Atmosphere Composition: 97% Hydrogen, 3% Helium and 0. 05% of Ammonia Density: 0. 69 g/cm³ Diameter: 120, 536 kilometers Distance from Sun: 1, 429, 400, 000 km Gravity: 9. 05 m/s² Mass: 5. 69 E+26 kg Temperature: -130 º C Axis Tilt: 25. 33 º

Sattelites Name Saturn's major satellites, compared to Earth's Moon Orbital Diameter Mass Orbital radius period (km) (kg) (km) (days) Mimas Enceladus Tethys Dione 400 0. 4× 1020 185, 000 (12% Moon) (0. 05% Moon) (50% Moon) 0. 9 (3% Moon) 500 (14% Moon) 1, 070 (30% Moon) 1. 4 (5% Moon) 1. 9 (7% Moon) 1. 1× 1020 (0. 2% Moon) 6. 2× 1020 (0. 8% Moon) 1, 120 11× 1020 (32% Moon) (1. 5% Moon) 238, 000 (60% Moon) 295, 000 (80% Moon) 2. 7 377, 000 (10% Moo (100% Moon) n)

Name Diameter (km)[ Mass (kg) Orbital radius (km) Orbital period (days) Rhea 1, 530 527, 000 20 23× 10 (44% Moo (140% Mo (3% Moon) n) on) 4. 5 (20% Moo n) Titan 5, 150 1, 350× 1020 1, 222, 000 (148% Mo (180% Mo (320% Mo on) on) (75% Mars) 16 (60% Moo n) Iapetus 1, 470 18× 1020 3, 560, 000 79 (42% Moo (2. 5% Moo (930% Mo (290% Mo n) n) on)

Did you know… • The satellite Titan is the largest satellite of Saturn? It is bigger than planet Mercury • The temperature at Saturn’s cloud tops -139°C or 218°F? • That Saturn’s rings are made of billions of ice particle?