1.The Milky Way - our Galaxy The Milky Way isone of billions ofGalaxies in theobservableuniverse. Our solar systemis one of millionsin the galaxy thathas a star in itscentre.

2. All Solar systems have a Star at their centre and ours is calledthe Sun, which all the Planets revolve around by the means ofgravity. 3. The sun is the biggest, brightest, and hottest object in the solar system. The sun is an ordinary star. The sun is made of about 70% hydrogen and 28% helium.Surface temperature:6,000 CAge:4.5 billion years (approx)Distance from Earth:150 million kmDiameter:1.4 million kmCore temperature:15 million C 4. Mercury is solid and iscovered with craters. Mercury has almost noatmosphere. Mercury is the eighthlargest planet.Discovered:Known since 3,000 years BCDiameter:4,900 kmTemperature on surface:-173 degrees Celsius -425 degrees CelsiusSurface gravity:3.7 m/s2Distance from the Sun:46 - 69 million kmTime taken to rotate on axis: 58 Earth daysTime taken to orbit Sun: 88 Earth daysMoons:None 5. Venus is the sixthlargest planet. Itsabout three-fourthsthe size of earth. The surface is rockyand very hot. TheatmosphereDiscovered:Known since 3,000 years BCDiameter:4,900 kmcompletely hides theTemperature on surface:-173 degrees Celsius - 425 degrees CelsiusSurface gravity:3.7 Discovered: In the prehistoric agesurface and traps theDiameter:12,100 kmTemperature on surface:462 C heat.Surface gravity: 8.87 m/s2Distance from the Sun:Varies between 107 - 109 million kmTime taken to rotate on axis:243 Earth daysTime taken to orbit Sun:224.7 Earth daysSatellites:NoneDistance from the Sun:46 - 69 million kmTime taken to rotate on axis: 58 Earth daysTime taken to orbit Sun: 88 Earth days 6. Earth is the fifth largest planet and the third from the sun. Liquid covers 71 percent of the Earths surface. The Earth has one moon.Age: 4.6 billion yearsDiameter: 12,700 kmTemperature on surface: -88 C to 58 CSurface gravity: 9.81m/s2Distance from the Sun: 150 million kmTime taken to rotate on axis: 23.9 hoursTime taken to orbit the Sun: 365.26Earth daysMoons: The Moon 7. The Moon controls our oceans and tides. The Moon is approximately quarter the size of the Earth.Age:4.6 billion yearsDiameter:3,480 kmTemperature on surface:Varies from-233 C to 122 CDistance from the Earth:About 386,200 kmand orbits the Earth every 28 days.Satellites:None 8. Mars is the fourthplanet from the sun. Mars has a thinatmosphere thatcontains mostlycarbon dioxide. Mars has two smallmoons.Discovered:Prehistoric timesDiameter:6,787 kmTemperature on surface:Between -153 C and 30 CDistance from the Sun:Varies between 206 and 249 million kmSatellites:2, Phobos and Deimos 9. The Asteroid belt is situated between Mars andJupiter.Discovered:Early 19th centuryDistance from the Sun:Variesbetween 387million km and 489million kmAsteroids:are irregular fragments ofrock left over from the formation ofthe Solar System 4.6 billion years ago 10. The Great Red Spot, ahuge storm of swirling gasthat has lasted forhundreds of years. Jupiter does not have asolid surface. The planet isa ball of liquid surroundedby gas. Jupiter is the largest planet Discovered:Prehistoric timesDiameter:143,000 kmin the Solar System.Temperature:-150 C (in theatmosphere)Distance from the Sun:Varies between 740 -817 million kmSatellites:63 known including Io, Ganymede,Europa and Callisto 11. Saturn is the second largest planet and the sixth from the sun. Saturn is made of materials that are lighter than water. If you could fit Saturn in a lake, it would float! Saturn is distinctive because of its rings.Discovered:Prehistoric timesDiameter:120,000 kmTemperature:-130 C (at cloud tops)Distance from the Sun:Varies between1,351 and 1,510 million kmMoons:52 officially named (and counting)including Titan 12. Uranus is the third largestplanet and the seventhfrom the sun. Uranus is one of the giantgas planets. Uranus is blue-greenbecause of the methane inits atmosphere.Discovered:1781 by William Herschel fromBath, EnglandDiameter:51,499 kmTemperature:-210 C (at cloud tops)Distance from the Sun:Varies between 2.7 and3 billion kmSatellites:27 13. Neptune is the fourth largest planet and the eighth from the sun. Because of the orbits, from 1979 to 1999, Neptune was the ninth planet. Like Uranus, the methane gives Neptune its color.Discovered:1846 (proved mathematically 1845)Diameter:49,500 kmTemperature:-220 C (at cloud tops)Distance from the Sun:Varies between 4.46and 4.54 billion kmSatellites:13 14. Pluto is the smallest planetand usually the farthestfrom the sun. Pluto is the only planet thathas not been visited by aspacecraft.Discovered:1930Diameter:2,301 kmTemperature on surface:-235 C to -210 CDistance from the Sun:Varies between 4.3 and7.4 billion kmSatellites:3 15. Http://www.nasa.gov/worldbook Http://science.nationalgeographic.com Solar system, Mercury, Venus, Earth, Mars,Jupiter, Saturn, Uranus, Neptune