The Search of Life In The Solar System
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1 The Search of Life In The Solar System 1 BY: Yasir M. O. ABBAS October 2017
2 Exploring New Worlds In Space 2
3 3 Evidences Is there an evidence for life out of the Earth??? Is there evidence that there isn t life out of the Earth??? No No Science of Probability Science of Possibilities
4 What do we search for? What happened to create life in the Earth? Do these CONDITIONS are there some where in the solar system? Don t forget this question but Let s answer it later! 4
5 5 What Is LIFE??? We KNOW nothing!!! CHANGE THE QUESTION: What Does Life Do? Takes energy Grows Reproduces Complexity????????
6 6 STOP Defining in details We don t want to define life, we take general characteristics. We want to find it.. will know when we do! We tend to think that what we have applies to the universe.. But that is not TURE always.
7 Photosynthesis Terrestrial life is based on the Sun. How do humans take energy from the Sun???? 7
8 Photosynthesis 8
9 9 Water Life needs LIQUID medium. Why water is special? chemical reactions. Transportation tool Abundance in the solar system. Found in liquid phase commonly. Universal solvent >> polar molecule. Water ice is less density than liquid water. Photosynthesis >> An easy process to store energy.
10 10 Alternatives Energy Sources Chemosynthesis. Methanogens (Archaea). Methane is the signature. Liquid Ammonia NH3
11 History of Life on Earth 4.5B Years old Almost half of the Earth s age the chemosynthesis was dominant. Then a switch flipped to photosynthesis. 11
12 Mars 1976 the Viking lander. Several Experiments Look for organics! Look for microbes! Not applicable due to decomposers. 12
13 13 Mars Looking for microbes Take a sample, add water and watch the waste. [waste came out] Take a sample, heat it, add water and watch the waste. [NO waste came out] Looking for organics Without diving in the details, the experiment involve heating the sample.
14 Mars Evidences for habitable warm and wet environment. More than 20 missions to Mars, 9 are active. There is water ice on Mars. The search is for liquid water. There re sings for that! 14
15 Mars A meteorite from mars has been found that never heated. The idea of exchanging lives raised. We just waiting to see their DNAs! 15
16 Methane in Mars Many scientific groups studying Mars announced to find methane in abundance. Wasn t convincing! Not verified! Till Curiosity said there is barely METHANE with some spikes! (No explanation yet) 16
17 Paradigm Shift The old model for habitability is to be in just the right distance from the star to have the liquid water on the surface. [1 AU] New Model: Tidal activity that enables liquid water beneath the ice. 17
18 Europa Oceans of salty liquid water under ice. The suitable Tidal Energy Dynamic. Rocky sea floor. Exploration & Flybys Voyager spacecraft. Galileo spacecraft. Future mission (ESA & NASA) 18
19 Europa About the size of our moon. 230% water compared to Earth. Metallic core. Rocky mantle. Water crust. 19
20 Enceladus Small rocky icy, just 500 Km No great tidal energy A lot of organics plus water. Slightly more dense region beneath the ice. All criteria but (time?)! Exploration and flybys: Cassini Spacecraft 20
21 Titan Saturn s moon. Large A lot of Methane causes the haze. Clouds. Rain!!! :D Exploration & Flybys Voyager spacecraft. Cassini spacecraft. 21
22 Titan There is water but as rocks Scientists are searching for methane based life. Very cold weather slows chemical reactions of taking energy. A lander from Cassini discovered decaying in (H2) near the surface. Mystery unrevealed!!! 22
23 A Mission to find life Galileo Spacecraft High Resolution Images Atmosphere compositions. Reflected waves. The results of atmosphere analyses shows abundant of: Water vapor Oxygen (Too Much) Methane 23
24 A Mission to find life Measurements of reflection of certain wavelength Images show no man made features at Res 1km, by 100m could see some. 24
25 A Mission to find life Intelligent life? Only one measurement showed that (Radio Rx) Steady frequency Modulated From below of the atmosphere. 25
26 26
27 27 Short Video (~5 mins)
28 References Based on The Science of the Solar System by CalTech in Coursera. Wikipedia website. NASA website. ESA website. 28
29 29 Q&A THANK YOU
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