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موجودات زنده بر روی مریخ ... !؟ چاپ ايميل

 از هنگامی که انسان شروع به مطالعه و کاوش پیرامون جهان اطراف خود کرده است سوالهای بسیاری ذهن او را به خود مشغول کرده است. هرچه بیشتر درک می کند در می یابد که کمتر می داند.

یکی از سوال های بنیادین این موجود دو پا همواره بر این بوده است که آیا به غیر از کره خاکی خودمان حیات در جای دیگری از این جهان پهناور وجود دارد ؟ نزدیکتر بیائیم... در منظومه شمسی خودمان چطور ؟ آیا موجودات زنده ای که تا به حال آنها را شناخته ایم می توانند در شرایط محیطی سیاره ای مانند مریخ رشد کنند ؟

اگر چندی پیش این سوال را از سیاره شناسان می پرسیدید جوابتان منفی بود ولی حالا با یافته ای که جدیدا به دست آمد می توان گفت که این امر امکان پذیر است.

به گزارش پايگاه ملي داده هاي علوم زمين، در مطالعات آزمايشگاهي كه اخیرا انجام شد و حدود دو سال به طول انجامید، محققان در یافتند كه برخي از ميكروارگانيسمها وجود دارند كه با برخورداري از قابليتي همچون تطابق خود با محيط هاي بسيار سرد، نه تنها در محيط هاي نامطلوب به حيات خود ادامه ميدهند، بلكه حتي در دمای 30 درجه فارنهايت هم می توانند تكثير شوند.

اين ميكروبها هم چنين از مكانيسم دفاعي جالبی برخوردارند كه از آنها در برابر دماي بسيار سرد محافظت ميكنند. این نوع از موجودات زنده می توانند در شرایط سیاره مریخ نظیر فشار و آب بسیار کم دوام بیاورند و حتی رشد کنند. این دو نوع میکرو ارگانیسم تازه کشف شده که با نامهای " هالوفیل " و " متانوژن " شناخته می شوند هر کدام شرایط رشد مخصوص به خود را دارند.

هالوفیل ها در دمای 30 درجه فارنهایت هم قابلیت رشد کردن دارند و حتی می توانند در زیر سطح مریخ با وجود آب شور زندگی کنند. متانوژن ها در دمای 28 درجه فارنهایت نیز زندگی می کنند و خصوصیت بارزشان تکثیر شدن در محیط بدون اکسیژن است.این نوع می تواند متان نیز تولید کند.

دانشمندان پس از بررسی انواع زیادی از میکروارگانیسم ها در شرایط سخت آزمایشگاهی توانستند این دو نوع موجود تک سلولی را بیابند که هر دو از انواع آزمایش ها سر بلند بیرون آمده بودند. با مطالعات بیشتری که انجام شد محققان دریافتند که این دو نوع میکروب نه تنها می توانند بر روی مریخ زندگی کنند بلکه قابلیت رشد در سایر سیارات مریخ مانند را نیز دارند.

در کهکشان راه شیری اغلب ستاره ها از خورشید ما سردتر هستند و به طبع نواحی اطرافشان دارای دمای کم است. بنابراین سیاراتی که در این منظومه ها شکل می گیرند دنیاهائی سرد و خاموش هستند.

با کشف این دو نوع میکروب دانشمندان امیدوارند که بتوانند میکروارگانیسم های دیگری را با خصوصیات متفاوت در این نوع سیارات بیابند. تا به حال اخترشناسان توانسته اند 200 ستاره خورشید مانند را که احتمال حیات در سیاره های اطراف آنها بیشتر از سایر سیاره ها است کشف کنند.

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