Space Travel Mars, Amazing fact Complete Documentary Film

Mars, the fourth planet has a diameter of 6,794 kilometers and it orbits at a distance of 228 million kilometers from the Sun. The surface gravity on Mars is 0.38 of the Earth gravity and the planet is about one-tenth the size of the Earth.Mars moves at a speed of 4 kilometers per second and takes about 780 days to complete one revolution around the Sun.One rotation on its own axis is completed in about 24 hours and 37 minutes.It has two moons called phobos which is 23 kilometer in diameter and demos which is 13 kilometer in diameter.Since it is relatively closer to the Sun as compared to the other outer planets,the surface temperature ranges from -9 degree to 23 degree centigrade.In the earlier centuries the astronomers believed that the Mars was very much like Earth.

Mariner VIII

The first photographs of Mars taken by the Mariner IV spacecraft in the year 1965, subsequently Mariner VIII took some in the year 1971.As a result of these pictures it was discovered that the surface of the planet was red in color, rocky and dry. In 1976 two unmanned Viking spacecraft were sent to this planet.The data send back by these spacecraft showed an absence of carbon atoms and living organisms in the atmosphere and soil.From these findings the scientists concluded that there could be no life on Mars and that it was a dead planet.Mars has a red color because of two reasons,firstly the soil and rocks are largely composed of Iron which has rusted due to exposure to weather thus giving them a reddish appearance,secondly the entire surface is covered with a fine dust which hangs in the air as a result of which a sky tends to have a reddish color rather than the usual blue.Mars also has a number of volcanoes and valleys which indicates that there may have been or there may still be geological activity on this planet. [caption id="attachment_909" align="alignnone" width="300"] Space Travel,Mars,photographs of Mars,Mariner VIII,Planet[/caption]