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International Edition Winners 2011: Algeria

International Edition Winners 2011: Algeria


Djaidja Noure El-houda
Rhea and Titan
Rhea and Titan
Djaidja Noure El-houda

 
Nouioua Fatima Zohra
Constantine, Algeria




"Saturn is the sixth planet from the Sun and the second largest planet in the Solar System. This planet is probably best known for its system of planetary rings, which makes it the most visually remarkable object in the solar system.

Scientists give it a very big consideration proved by the history of exploration and numerous of expeditions.

Cassini is one of the most ambitious space missions of the moment. With the objective of studying Saturn and its satellites, the orbiter gives us information and stunning images, so the objective of the Cassini mission is to study Saturn, its rings and its satellites. Thus Cassini orbiter has mission for one of three objectives. For that I see that the third objective is most important which is: a closer view of moons Titan and Rhea. Because this task will give more clear insight of these two satellites and their secrets, more results, to take a long sustained look especially with raw images which can then confirm scientific facts. I think there should be an in depth search about the two moons.

And we should remember that extra solar astronomy is coming, and if we don't study well the planets at hand in our solar system, what we soon learned from those planets may render what we are learning of no use!

What we learned from hazy Titan:

Titan is one of the 53 Saturn's moons and it's the largest satellite of this planet and the second largest one in the solar system. Rhea is the nineth largest moon in the solar system and the second one after Titan.

So to prove all these theories: that Titan's surface shares similarities to Earth. It appears to have had a volcanic history, has hilly areas and smooth areas.
And perhaps there is subsurface water on Titan, which could enhance the chances of life existing, either now, in the past, or even in the future.

Cassini will take a long, sustained look at the hazy moon. And gives clear images of its large patches of clouds, and its trailing hemisphere, or the side that faces backward as Titan orbits around Saturn. If Titan cooperates and has a cloudy day, scientists analyze the pictures for cloud patterns.

And what we learned from its little sister Rhéa:

Rhea's surface divided into two geologically different areas based on crater density, for about the second area, in parts of the polar and equatorial regions, has only craters under that size, so the raw images may confirm that if a major resurfacing event occurred some time during its formation. Scientists also think that Rhea probably has rings but some of them don't expect if it exists around moon. Until now, only planets were known to have rings and we have many possibilities for that.

And for the physical characteristics ; earlier it was assumed that Rhea had rocky core in the center. However measurements taken during a close flyby by the Cassini orbiter in 2005 casts this into doubt, though this remains controversial, so it can articulate that .
It could find the evidence that Rhea's streaks in fact are ice cliffs similar to those of Dione.

Conclusion:

At the end the mission suggests to us some new directions of research about this great planet and its exciting satellites. Also it suggest than there should be an after Cassini and that all this harvest of results should be completed. But then beware because extra solar astronomy is coming."