Spacecraft

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Spacecraft vehicles designed to operate in the vacuum-weightlessness-high radiation environment of space : used to conduct utilitarian operation ( eg : telecommunications), and to conduct research (eg : micro-gravity experiments ). The first spacecraft ( Sputnik 1 ) was launched by the USSR in 1957 (4 Oct)

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What is a Catalytic Converter?

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A catalytic converter is used to reduce the amount of harmful gases pumped into the atmosphere by vehicles. The converter is a metal case containing a metal or ceramic in the shape of a honey comb which is coated with a precious metal like platinum or rhodium which acts as a catalyst. The converter is fixed into the exhaust pipe of the vehicle. As the engine's exhaust gases flow through the honey comb, the catalyst converts the harmful gases like carbon monoxide, oxides of nitrogen and hydrogen into water vapour and carbon dioxide.
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Why are Olympic Games Held Every Four Years?

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T he first known Olympic games were held at Olympia in Greece in 776 B.C . They grew out of a religious ceremony held there that involved a sprinting race, They were held after every four years after a legend that the race of the religious ceremony should be done after four years. The Greek games ended in 394 A.D . 1500 years later, the modern Olympics were revived in 1896 and it was decided to stage them after every four years, exactly as it was done during ancient Greek times. Olympics have become the most magnificent sports festival of the world. Each time they are held in a different country where athletes from different nations compete in races , jumping, gymnastics, football, yatching and many more contests.
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How is Air-traffic Control Organized?

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A ir-traffic controllers make sure that planes take off and land safely and fly without any delays. The pilots are told where to fly so that no air collision takes place. The radar provides the air-traffic control staff with updated information about the exact position, destination and identity of every plane and about the weather conditions. When a plane is about 2,700 metres away from an airport and 600 metres above it, it enters the terminal control area. Working from this centre, the controller guides the pilot telling him at which height to fly or wait and circle the airport, when the plane has to land, etc. The controllers are also responsible for aircraft taking off and they also control planes throughout their flight from one airport to the next.
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Stock Market Alert Service

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<$<$<  Stock Market Alert Service  >$>$> To Subscribe : - Users who will subscribe to this application should type REG atrad and SEND the SMS to 77000 To Unsubscribe : - Type UNREG atrad  and SEND the SMS to  77000 Available on Dialog , Airtel and Hutch Users only ! *T&C Apply Available on Dialog , Airtel and Hutch Users only !
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What is the Colour of Sea?

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Sea waters are clear, but the colour of the sea appears due to the reflection of the sky. So with a grey sky, the sea will be grey. The deeper the water, the deeper is the colour. It appears blue on the surface of the ocean and then gradually darkens into violet and deep purple. This is because the light from the rays of the sun are made up of seven colours. As the light passes through water, these colours are lost one by one, the first colour starts vanishing at the depth of around 120-150 metres. At around 500 metres depth, we lose the blue and violet rays, and at 800 metres the deep purple. After this depth, all is darkness.
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