The Solar system was formed about 4560 million years ago.It is made up of the nine Planets – Mercury,Venus,Earth,Mars,Jupiter,Saturn,Uranus,Neptune and Pluto – as well as their moons commets and other bodies.These all orbit around our Sun,to which they are attracted by gravity.
Diameter : 4880 km
Mass : 3302000000000 tonnes
Average Distance From Sun : 57909175 km
Rotation : 58.6462 days
Orbit : 87.969 days
Average Temperature : +166.860 C
Moons : 0
Mercury was named after the speedy messenger of the gods because it seemed to move more quickly than the other known planets.In 2004 Nasa launched MESSENGER Probe which entered orbit around Mercury on March 18, 2011.
Diameter : 12103.6 km
Mass : 48690000000000 tonnes
Average Distance From Sun : 10208930 km
Rotation : 243.0187 days
Orbit : 224.701 days
Average Temperature : +456.850 C
Moons : 0
In size,mass,density and volume Venus is the planet most similar to Earth.Venus rotates backwords,from east to west,so the Sun would appear to rise in the east and set in the west.In april 2006 the Europian Space Agency’s Venus Express spacecraft reached Venus.
Diameter : 12756.3 km
Mass : 59720000000000 tonnes
Average Distance From Sun : 149600000 km
Rotation : .99727 days
Orbit : 365.256 days
Average Temperature : +150 C
Moons : 1
Earth is a watery planet – 70 percent of its surface appears blue – and the only one that can support life.From Space,astronauts have observed cities,forest fires,roads,airports,dams and other,large structures such as the great pyramid and Great Wall of China.
Diameter : 6794 km
Mass : 6421900000000 tonnes
Average Distance From Sun : 227940000 km
Rotation : 1.025957 days
Orbit : 686.98 days
Average Temperature : -630 C
Moons : 2
Sevaeral Space Probes have flawn past or landed on Mars,Providing informations on its atmosphere and features,such as the Volcano Olympus Moon.This Stands 27 km high – more than three times the height of Mount Everest.The Latest Craft to visit the red planet is Mars Reconnaissance orbiter,which began a four year orbit in 2006.
Diameter : 142984 km
Mass : 18986000000000000 tonnes
Average Distance From Sun : 778412010 km
Rotation : 9 hours 50 minutes
Orbit : 11 years 314 days
Average Temperature : +14.850 C to +19.850 C
Moons : 63
Jupiter is the largest planet in the solar system and is big enough to contain more than a thousand Earths.Four of its many moons were among the first ever astronomical discoveries made with a telescope,by Galileo in 1610.More were later indentified by laters astronomers and in1979 by the space probe Voyager 2.
Diameter : 120563 km
Mass : 5684600000000000 tonnes
Average Distance From Sun : 1426725400 km
Rotation : 10 hours 34 minutes
Orbit : 29 years 168 days
Average Temperature : -139.50 C
Moons : 34
Saturn is the second largest planet but the least dense.Its dinstictive rings are made of pices of ice and rock which were probably parts of comets and asteroids.These rings are being examined by the joint NASA/Europian Space Agency Projet Cassini/Huygens.Launched in 1997,Cassini began a four – year orbit of the ringed planet in July 2004.
Diameter : 51118 km
Mass : 868320000000000 tonnes
Average Distance From Sun : 2870972200 km
Rotation : 17 hours 17 minutes
Orbit : 84 years 4 days
Average Temperature : -197.150 C
Moons : 27
All the named of satelite of Uranus are called after characters from either william Shakespear’s plays or Alexander Pope’s poem The Rape of The Lock Some have only recently discovered and as yet do not have names.Uranus has rings like those of Saturn,but they are visible only with a powerful telescope.
Diameter : 49522 km
Mass : 1024700000000000 tonnes
Average Distance From Sun : 4498252900 km
Rotation : 16 hours 7 minutes
Orbit : 164 years 298 days
Average Temperature : -200.15 0 C
Moons : 13
The orbits of Neptune and Pluto cross each other.Neptune is the Furthest of the nine Planets currently,and for twenty years of every 248.Surface winds are the strongest of any planet at upto 2000 km/h.Neptune’s Year is So Long that, On 11 July 2011, It just completed its first full barycentric orbit since its discovery in 1846.
Diameter : 2390 km
Mass : 129000000000 tonnes
Average Distance From Sun : 5913520000 km
Rotation : 6 days 9 hours 18 minutes
Orbit : 247 years 256 days
Average Temperature : -215.350 C
Moons : 3 (Charon and two unnamed,discovered in 2005)
Though discovered by an american,Pluto’s name was suggeted by an 11 year old british schoolgirl,Venetia Burney.For Mission Pluto,a spacecraft named New Horizons launched from Cape Canaveral Air Force Station in In 19 – January – 2006.