Geography
- Galaxy - Galaxy are large clusters of stars, gas dust etc
- A powerful the biggest telescope in the world- Keck Telescope in Hawaii
- Light years - The distances in space are very very vast and are measured in light years
- Andromeda is the closest galaxy to our galaxy
- The Sun- is 150 km away from the Earth
- Sun light travels at tremendous speed it takes 8.3 minutes to reach the Earth
- The Surface temperature of the Sun is 6000 degree Celsius.
- Sun is nearly 300000 times the weight of the Earth
- The galaxy to which our Sun belongs is called the Akash Ganga or the Milky Way
- Galileo Galilei, the Italian astronomer was the first person to study the sky with a telescope
- Solar System means - The family of the Sun, eight planets and more than 150 satellites make up the solar system
- How many Planets are there our solar system - Mercury, Venus,Earth, Mars, Jupiter, Saturn, Uranus, Neptune
- Pluto - in 2006, The International Astronomical Union (UAU) reclassified Pluto as a dwarf planet.
- The word Planet is originally a Greek word which means 'Wanderer'
- The First four are inner planets (Mercury, Venus, Earth, Mars). Its also called Terrestrial Planets
- The Last four are outer planets (Jupiter, Saturn,Uranus and Neptune). Its also called Jovian Planets
- The Jupiter is the largest in Size of all planets
- Mercury has the shortest orbit around the Sun. It takes only 88 days to complete one revolution
- Venus it is the hottest planet. (What the reason: Sulphuric Clouds and gases that trap its heat. Venus its called for morning star, evening star, Earth twin
- Mars is called Red Planet
- Saturn look a rings arount it. These rings are made of dust particles, rock and ice.
- Note: Now we found rings around Uranus and Neptune
- Jupiter and Saturn send out strong radiations.
- Uranus and Venus rotate from east to west and other planets rotate from west to east.
- The Earth takes nearly 24 hours (actually 23 hours and 56 minutes) to complete one rotation
- Jupiter is much fast than other planets. It speed of 9 hours and 55 minutes.