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> Life on Mars? > Mars vs. Earth: Similarities and Differences > Planet of Mystery
dimarts, 27 de maig de 2003
On June 2, just before midnight, the spacecraft Mars Express will blast off for Mars, where it is expected to land around Christmas of this year. The journey of hundreds of thousands of kilometers will take nearly seven months to complete and represents the first large scale project undertaken by the European Space Agency (ESA).
The spacecraft, Mars Express, is due to be launched from Kazakhstan aboard a Soyuz-Fregat rocket includes a probe, called the Beagle 2, which will separate from the ship just one week before entering the orbit of Mars. The satellite will then continually orbit the Red Planet and through the use of radar, will begin its mission of searching for water on the planet's surface. As this effort is underway, the probe will collect data about mineral composition, the weather and the effect of winds upon the atmosphere, but most of all, it will be looking for proof of former life on the planet. The mission's primary objective is none other than to determine for once and for all whether life has ever existed on any other planet than Earth. An ambitious claim, and one difficult to prove, despite the evidence that at one time there was an abundance of water on Mars. Whatever the outcome, Mars Express will not be alone in space. Also during the month of June the North American Space Agency (NASA) will be sending two powerful spaceships to Mars that are projected to land at the beginning of January. Additionally, the Japanese ship Nozomi will also be arriving, after a problem-riddled journey of nearly 5 years. Surely with all these missions taking place, new knowledge will be forthcoming about our neighboring planet...
Life on Mars?The debate about whether there is life on Mars has gone on for years and years. Today what we do know for sure is that the planet's present conditions make it impossible for any known form of life to survive. Consider that the Red Planet has a gravity force much smaller than that of Earth, which explains why the gas layer is very fine. And what repercussions does this have? It's very simple. This means that the rays of the sun pass through unfiltered, making the ground a veritable wasteland. What Mars does possess is an abundance of carbon dioxide, a heavy gas that renders the atmosphere completely unbreathable. What's more the enormous fluctuation of temperatures creates strong winds that further erode the already beleaguered surface. And as if that weren't enough, the ozone layer, which protects against ultraviolet rays, is extremely thin. All these factors combine to produce the reddish aspect that shows up in images captured of the planet. Nonetheless, none of this means that life did not exist at one time, millions and millions of years ago. It has been established that the atmosphere was once much more compact and that the rains created rivers… Who knows? It's quite possible that the next few missions to Mars will eliminate doubts.
Mars vs. Earth: Similarities and DifferencesMars and Earth are relatively close in proximity, a fact that explains the many similarities between them. Both have a structure consisting of a nucleus, a stratum, and a crust: the period of Mars' rotation, that is to say the duration of one revolution on its own axis, is 24 hours and 37 minutes, nearly the same as that of Earth. Mars is the third smallest planet, while ours is the fifth. The Red Planet has mountains and volcanoes, and the presence of water in ancient times left behind grooves and canyons similar to the ones on our planet. Now, the comparison does not only yield similarities. On Mars, the difference between the daytime and nighttime temperatures is huge, due to the extreme thinness of its atmosphere. Earth, the Blue Planet only has one satellite, the Moon, compared to Mars' two: Phobos and Deimos. The average temperature of the Red Planet is -63º centigrade while Earth's is 15…
Planet of MysteryMars has always been shrouded in mystery and has long been an object of fascination, exerting an influence upon ancient cultures and civilizations. Its not unusual that war was waged in the name of the god of war in Roman mythology nor that the planet's satellites bear terrifying names: Phobos, a word that in Greek means 'fear' and Deimos, another Greek word which is a synonym meaning 'terror'. In any case, there are many reasons that have contributed to making Mars the planet of mystery, par excellence: the luminosity of the planet that can be seen from Earth when the planets are at their closest, something that happens every two years; the references made to the planet by science fiction writers; and not among the least, the provocative impact of the 1976 discovery of human faces carved into its surface, despite the fact that the 'sculptures' were later proven to be the result of an optical illusion. All in all, it’s no wonder that earthlings tend to draw an association between extraterrestrials and 'Martians'.
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Investiga
> Què defineix un planeta? La resposta, en aquesta pàgina.
> Saps el temps que triga Mart a fer la volta completa al Sol? Esbrina-ho aquí.
> Vols veure les més variades imatges del planeta Mart? Doncs contempla’n a pleret.
> Vols saber quines han estat les missions espacials més importants dutes a terme fins ara? Vés a aquesta adreça.
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