The Milky Way - our Galaxy• The Milky Way is one of billions of Galaxies in the observable universe.• Our solar system is one of millions in the galaxy that has a star in its centre.
• All Solar systems have a Star at their centre and ours is called the Sun, which all the Planets revolve around by the means of gravity.
• 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 ºCAge:4.5 billion years (approx)Distance from Earth:150 million kmDiameter:1.4 million kmCore temperature:15 million ºC
• Mercury is solid and is covered with craters.• Mercury has almost no atmosphere.• Mercury is the eighth largest planet. Discovered:Known since 3,000 years BC Diameter:4,900 km Temperature on surface:-173 degrees Celsius - 425 degrees Celsius Surface gravity:3.7 m/s2 Distance from the Sun:46 - 69 million km Time taken to rotate on axis: 58 Earth days Time taken to orbit Sun: 88 Earth days Moons:None
• Venus is the sixth largest planet. It’s about three-fourths the size of earth. • The surface is rocky and very hot. The atmosphereDiscovered:Known since 3,000 years BCDiameter:4,900 km completely hides theTemperature on surface:-173 degrees Celsius - 425 degrees CelsiusSurface gravity:3.7 Discovered: In the prehistoric age surface 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
• Earth is the fifth largest planet and the third from the sun. • Liquid covers 71 percent of the Earth’s 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
• 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
• Mars is the fourth planet from the sun. • Mars has a thin atmosphere that contains mostly carbon dioxide. • Mars has two small moons.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
• The Asteroid belt is situated between Mars and Jupiter. Discovered:Early 19th century Distance from the Sun:Varies between 387million km and 489 million km Asteroids:are irregular fragments of rock left over from the formation of the Solar System 4.6 billion years ago
• The Great Red Spot, a huge storm of swirling gas that has lasted for hundreds of years.• Jupiter does not have a solid surface. The planet is a ball of liquid surrounded by gas.• Jupiter is the largest planet Discovered:Prehistoric times Diameter:143,000 km in the Solar System. Temperature:-150 °C (in the atmosphere) Distance from the Sun:Varies between 740 - 817 million km Satellites:63 known including Io, Ganymede, Europa and Callisto
• 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
• Uranus is the third largest planet and the seventh from the sun.• Uranus is one of the giant gas planets.• Uranus is blue-green because of the methane in its atmosphere. Discovered:1781 by William Herschel from Bath, England Diameter:51,499 km Temperature:-210 ºC (at cloud tops) Distance from the Sun:Varies between 2.7 and 3 billion km Satellites:27
• 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
• Pluto is the smallest planet and usually the farthest from the sun.• Pluto is the only planet that has not been visited by a spacecraft. Discovered:1930 Diameter:2,301 km Temperature on surface:-235 °C to -210 °C Distance from the Sun:Varies between 4.3 and 7.4 billion km Satellites:3