Ptolemaic Solar System celestial spheres wikipedia System Solar Ptolemaic

Ptolemaic Solar System celestial spheres wikipedia System Solar Ptolemaic

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A little interesting about space life.

However, if we look closely on the original moon landing footage, we can see that the flag is actually standing still, and not moving in any way during the entire tape. But why is the flag still?



and here is another

To make the flag stand still on the moon, the flag was actually made from plastic material, similar to the one that tents are usually made of. For practical reasons, the flag was originally folded to maximize space and stored in a thin tube. After Neil Armstrong planted it to the surface of the Moon, it briefly appeared to move as it was unfolding itself to its final shape.



and finally

There is also a famous farmer's manual called the Maine Farmers Almanac, which was used to record the weather and moon phases. The first full moon of the month was recorded in red on the due date and the second full moon of the month, recorded in blue. This could be the first modern day origin of the term. When there are two full moons within a calendar month, in modern times the second full moon of the month is referred to by meteorologists and astronomers as a blue moon. This only occurs once every 33 months. Not that rare really. The last one was in July 2004 and the next after today's will not grace us with its presence until December 2009. Hence the term, "Once In a Blue Moon".

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The scientists modeled different temperatures and water abundances that may have been present in the Moon-birthing disk. At higher temperatures, their disk was primarily composed of silicate vapor, which formed as a result of evaporation of the mantles of both the proto-Earth and the doomed Theia. The disk at these higher temperatures also contained a relatively small quantity of hydrogen dissociated from water. In contrast, at lower temperatures, their disk was primarily composed of water, from which hydrogen did not dissociate under this cooler temperature range--thus making its escape mechanism very inefficient.



Such moon-forming mergers and collisions are not unheard of. For example, the leading theory explaining the formation of Earth's own large Moon, suggests that it was born about 4.5 billion years ago when a Mars-sized protoplanet, dubbed Theia by astronomers, collided with our planet. Just as our Moon is identical geologically to Earth's mantle, the six medium-sized icy sister moons of Saturn are all similar in composition to Titan's icy mantle, the researchers announced in October 2012.



So whether you're sailing down Moon River or giving a good howl, take a good look at the Moon, our guidepost to the monthly cycle of our lives.