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The existence of ample amounts of hydrogen in the subsurface ocean of Enceladus indicates that microbes--if any exist there--could use it to obtain energy by mixing with carbon dioxide dissolved in water. This particular chemical reaction, termed methanogenesis, because it manufactures methane as a byproduct, may have been of critical importance in the emergence of life on our planet.
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Titan's atmosphere is approximately 95% nitrogen. However, in a way that dramatically differs from Earth's own mostly-nitrogen atmosphere, Titan's atmosphere has very little oxygen. Indeed, the remainder of Titan's atmosphere is almost entirely composed of methane--along with small qunatities of other gases, such as ethane. At the extremely cold temperatures that are found at Saturn's great distance from the heat of our Star, Titan's methane and ethane can accumulate on its icy surface to form pools of liquid.
In addition, the newly collected data derived from the GRAIL mission helps astronomers redefine the late heavy bombardment--a proposed episode that occurred about 4 billion years ago, during which a heavy shower of projectiles pelted the bodies of the inner Solar System, including Earth and its beloved Moon, creating heavy lunar cratering in the process. The concept of the late heavy bombardment is primarily based on the ages of massive near-side craters that are either within, or adjacent to, dark, lava-flooded basins (lunar maria), that are named Oceanus Procellarum and Mare Imbrium. However, the composition of the material existing on and below the surface of the lunar near-side indicates that the temperatures beneath this area are not representative of Earth's Moon as a whole at the time of the late heavy bombardment. The difference in the temperature profiles may have caused scientists to overestimate the amount of crater-excavating projectiles that characterized the late heavy bombardment. New studies by GRAIL scientists indicate that the size distribution of impact craters on the lunar far-side is a more accurate reflection of the crater-forming history of the inner Solar System than those pock-marking the near-side.
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Going to the moon again is causing far more controversy today than it could have back in the sixties. Some Americans doubt we can afford it and others are not sure they have seen the "giant leap for mankind" that the first moon shot promised. It depends on who you ask but don't dare ask me. I didn't think the first moon landing had much significance for reasons that few people share with me.
"There's an assumption we do have to make, which is that there's no changes in the material itself, and that all of the bumps we're seeing (in the gravity field) are from changes in the porosity and the amount of air between the rocks," Dr. Soderblom continued to explain in the September 10, 2015 MIT Press Release.
The most widely accepted scenario, explaining our Moon's mysterious and ancient birth, is termed the Giant Impact Theory. According to this theory, Earth's Moon was born as the result of a gigantic collision between our still-forming planet and a primordial Mars-sized protoplanet that has been named Theia. The tragedy that was the doomed Theia probably had an orbit that crossed Earth's--making such a catastrophic collision difficult to avoid. It is thought that the impacting Theia hit our planet hard, but swiped it with a glancing blow at precisely the right angle. In fact, Theia came very close to bouncing off Earth, but was swallowed instead. The blast dispatched shock waves across our ancient planet, hurling debris and gas screaming into space. For a short time, Earth had a ring around it that was composed of this ejected material.