Astronomy Now 2019 bouncing boulders and collapsing cliffs on comet 67p Now Astronomy 2019

Astronomy Now 2019 bouncing boulders and collapsing cliffs on comet 67p Now Astronomy 2019
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The largest, shining object in Earth's starlit night sky, our Moon has long been the source of mystery, myth, and poetry--a captivating inspiration for those who stare at the sky in wonder. But Earth's Moon is a very real object--the only body beyond our own planet that we have actually set foot upon, leaving our lingering footprints in its distant, alien dust. Earth's Moon has been with us almost from the very beginning, and even though it is our planet's closest companion in space, it has nonetheless managed to keep some of its ancient secrets very well. In September 2015, astronomers released a new study that shed light on Earth's bewitching companion's ancient and secretive past. Although our Moon now appears to be unchanging, as if it has always been exactly the same as it appears now--going through its beautiful and, yet, familiar phases, and controlling our ocean tides--in the distant past, things were actually very different.



Titan orbits Saturn once every 15 days and 22 hours. Like Earth's large Moon, in addition to many other moons in our Solar System, Titan's rotational period is precisely the same as its orbital period. This means that Titan only shows one face to its parent-planet, while the other face is always turned away.



A Lunar Eclipse is when our blue/green globe saunters between the trusty moon and glowing sun, our planet completely blocks the luminous rays of the sun but the moon remains visible.

Sagittarius: The Adventurer Searching for Deeper Meaning in Life. Nov 21-Dec 21. Ruling Planet: Jupiter. Element: Fire. Gender: Masculine



"The whole process of generating porous space within planetary crusts is critically important in understanding how water gets into the subsurface. On Earth, we believe that life may have evolved somewhat in the subsurface, and this is a primary mechanism to create subsurface pockets and void spaces, and really drives a lot of the rates at which these processes happen. The Moon is a really ideal place to study this," Dr. Soderblom explained in the MIT Press Release.



First launched as GRAIL A and GRAIL B in September 2011, the two probes, playfully dubbed Ebb and Flow, operated in an almost-circular orbit near the lunar poles at an altitude of about 34 miles until their mission concluded in December 2012. The distance between the twin probes altered slightly as they flew over areas of lesser or greater gravity that resulted from visible features--such as craters and mountains--as well as by hidden masses secreted beneath our Moon's surface.

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