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WHY DID ASTRONOMERS THINK THERE MIGHT BE LIFE ON MARS? (मंगल ग्रहमा जीवन हुन सक्छ भनेर खगोलविद किन सोच्छन ?

WHY DID ASTRONOMERS THINK THERE MIGHT BE LIFE ON MARS? (मंगल ग्रहमा जीवन हुन सक्छ भनेर खगोलविद किन सोच्छन ? 

As you know, scientists are now conducting all kinds of expirements to see if life can be found anywhere else in the Universe. Naturally, it is easier to explore our own solar system for signs of life than it is probe outer space. And one of the place where spme scientists thought a form of life might have been found in the planet Mars.

Why did they pick Mars? Well, Mars is considered to be a sort od twin of our own planet Earth. It is the next planet beyond the Earth in distance from the Sun. Mars is about half the diameter of the Earth and it rotates around the sun in just under two years. But Mars has a day that is almost equal in length to our day here on Earth.

In observing Mars, astronomers have noticed certain things that indicates a form of life may be possible there. First of all, Mars has seasons like the Earth. In fact, as the season change on Mars, there seems to be changes in it's surface. The dark areas ger stronger in the spring and summer, and the colour changes from bluish-green to yellow. Could this be vegetation? 

Astronomers also believe that there is at least a small amount os water vapour present in atmosphere of Mars, and this would be helpful in supporting life. Then, too, in 1887 an italian astronomer, Giovanni Schiapareli, reported seeing markings on the surface of Mars that resembled canals. "Could these have been built by Martians in order to carry water from polar regions to the desert areas?" scientists wondered.

In 1976 two American Viking space probes landed on the surface of Mars. The instruments in the space probes searched the surrounding soil for signs of life and radioed their results back to Earth. These results showed that either there are germs in the soil or that soil is very unusual and not like that on Earth. If life does exist on Mars it would be very simple form of life.

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