Thursday, 6 November 2014

Extremophiles in our Environment

     Hearing inspirational stories about fellow humans camping out on mountaintops  and hiking through deserts has left us to believe that we've got survival and adaptation down to a science. But have we really? If we were to consult our minuscule friends--of the bacteria variety--they'd probably laugh in our face. With fossils dating back to more than 3.5 billion years old, these prokaryotic organisms--more specifically, extremophiles--are the true definition of adaptation.

     Bacteria literally exist everywhere (perhaps not as much in Purell sanitizer bottles) and are the bane of our existence. From the early stages of childhood, we were always screamed at by our parents to wash our hands, brush our teeth, refer to the 5 second rule for dropped food, and cough into the crook of our elbows. But just how much bacteria were we fending off by dutifully following those instructions? The answer is, not enough. The typical human body is covered by so many of these unseen and unfelt creatures that if you were to remove them all, you'd have enough to fill up a large soup can!

     Here are some fascinating photos of extremophiles (organisms that thrive in extreme conditions).

The photo above is of a thermophilic bacterium species. 
It thrives in heated environments, and can live in temperatures up to 100°C.
Can be found in heated regions such as hot springs. 

The Halobacillus Karajensis is a halophile, which is a extremophile that
grows optimally in NaCl concentrations. It can withstand conditions that
 are 10x saltier than seawater. 

The Deinococcus Radiodurans shown above is a type of extremophile
 bacterium that can defy colossal amounts of radiation. They can
also survive drought conditions and lack of nutrients. 

     Life on an active volcano seems very inhospitable, but extremophiles have found a way to make it work. Recently, signs of [very small] life have been found on South American volcanoes. These microscopic organisms have to face challenges such as 56°C days, dry environments, ultraviolet radiation, and frigid conditions. The D. Radiodurans, as seen above, can withstand a 15,000 gray dose of radiation. In comparison, humans can only withstand 10.
     
     Activity has also been found in other intense environments, such as within Earth's crust below the ocean floor! These extremophiles live in a tremendous reservoir of hot water below ocean floors. 

     In addition, bacteria was discovered behind a layer of ice that was coating a lava tube that once flowed through the Cascade Mountains. These conditions are a less-extreme replica of life on Mars--ice-cold and bone-dry. The ice layer blocked out most of the oxygen and it was devoid of food source. However, the bacteria managed to thrive by living off the olivine deposits found in the basaltic lava tubes. 

     It's incredible how much life can thrive under these extreme environments. It's good to know that something is making use of these living conditions, because humans for now and the foreseeable future will not be able to. This raises the question, "are bacteria superior at adaptation?" According to these statistics, it would appear so. Perhaps one day, humans will also be able to survive in colder, drier, hotter and more radioactive environments. 





















Monday, 15 September 2014

Significance of Lagrange Point L1

Lagrange Points are basically the parking lots of outer space--on a larger scale. The ideal goal here would be to fixate a satellite in a stable position, in order to study space. However, (much like a shark) a satellite must be in constant motion to stay up. But with all the activity and movement in space, how how will a mere satellite survive long enough to tell the tale? 
What if I told you there was a way to make that happen? 

You'd probably protest: 


But actually, you can! In short, in 1772, a mathematician and astronomer called Joseph-Louis Lagrange discovered the solution to the 3 body problem. 
J.L Lagrange portrays himself as a humble mortal as he
glumly stares at a unknown object.  

He found out that by placing satellites in strategic points, the satellites managed to stay out of harm's way whilst effectively returning information to enthusiastic astronomers! Obviously, he named this discovery after himself. (Read: Lagrange Points/L for short)
L1 To begin off, it is common knowledge that when an object is in closer proximity to the sun, it will move faster. 


If a spacecraft were to be placed in-between Earth and the Sun with an equal distance between the two, the pull of Earth's gravity can level out some of the Sun's, making the spacecraft move slower. This can be manipulated to the point where the spacecraft orbits the sun at approximately the same speed as earth, much like the photograph shown above. 

Now, the L1 is an a excellent position to observe both the sun and earth, as well as the space surrounding the two. The perks of maintaining this position in orbit are twofold; first, the spacecraft needs to orbit in order to stay up, and second, this greatly minimizes the possible collisions the spacecraft will have with miscellaneous things in the solar system. 







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