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Mars : un satellite nommé Phobos

1 – Le texte avant de répondre aux questions :

 Phobos is the larger of the two satellites of Mars. It was discovered by Asaph Hall on August 18th, 1877. It orbits within 9300 km of the surface of Mars on its equatorial plane. By this proximity, an observer who would land near the poles would not see the satellite !

Its orbital period is less than one Martian day and it quickly crosses the sky of the planet, rising up from the East and setting down to the West. Its orbit is a spiral that inexorably approaches  closer to the Martian surface, on which it will be crashing in 100 million years approximately.

Phobos is dotted with impact craters like all telluric solar system objects. The crater Stickney of 9 km in diameter, is the largest crater in this Martian moon : it is nearly half the diameter of Phobos. It was thus named in honour of Chloe Angeline Stickney Hall,mathematician and wife of astronomer Asaph Hall.

The names of the two moons of Mars are an allusion to a Greek verse from the Iliad,'The God of War arrives, flanked by his two satellites ( thugs ) fear and terror'; Phobos is Greek for 'fear' and Deimos 'terror'.

2 – Exercice :

COMPLETER avec les éléments corrects les phrases suivantes.

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1. Mars has got 342Je ne sais pas natural satellites circulating through its sky.

2. The names of these satellites are Phobos and DeimosThermosPhebusJe ne sais pas.

3. Phobos was discovered by Asaph HallAlbert EinsteinJe ne sais pas on August 18th, 1877.

4. Phobos will crash on Mars surface in 100 billion100 millionJe ne sais pas years.

5. The largest crater of Phobos is nearly halfone quarterone thirdJe ne sais pas of its diameter.

6. The name of the largest crater located on Phobos is the crater VickneyStickneyHallJe ne sais pas.

7. It was thus named in the honour of Asaph Hall's petAsaph Hall's fatherAsaph Hall's wifeJe ne sais pas.

8. Chloe Angeline Stickney was a mathematicianastronomerJe ne sais pas.

9. The names of the two moons of Mars are an allusion to a Greek verse from the Iliadthe AeneidJe ne sais pas.

10. Phobos is Greek for " fear "" dread "" scare "Je ne sais pas and Deimos “terror”.