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It is important to know at any age!
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.
and here is another
A billion years ago, our Moon was closer to Earth than it is now. As a result, it appeared to be a much larger object in the sky. During that ancient era, if human beings had been around to witness such a sight, it would have been possible to see the entire Moon--not merely the one near side face that we see now. A billion years ago, it took our Moon only twenty days to orbit our planet, and Earth's own day was considerably shorter--only eighteen hours long. Stupendous, almost unimaginably enormous tides, that were more than a kilometer in height, would ebb and flow every few hours. However, things changed, as the lunar orbit around our primordial planet grew ever wider and wider. Annually, Earth's Moon moves about 1.6 inches farther out into space. Currently, the lunar rate of rotation, as well as the time it takes to circle our planet, are the same.
Saturn is the smaller of the two gas-giant planets, twirling around our Sun, in the outer regions of our Solar System--far from the delightful warmth of our lovely incandescent roiling gas-ball of a Star. Jupiter is the larger of the duo of gas-giants dwelling in our Solar System, as well as the largest planet in our Sun's bewitching family, which is composed of eight major planets, an assortment of moons and moonlets, and a rich menagerie of smaller objects. Saturn is the second-largest planet in our Solar System--and probably the most beautiful.
- International Space Station Tracker Chart
- Neptune Planet Surface Area
- Planet Venus Atmosphere Layers
- Space Shuttle Clip Art Cute
- NASA Emblem Black and White
- Earth Map NASA
- Fly Bys Vvoyager 2 NASA
- NASA Aerial View of USA
- Sirius Star Temperature
- NASA Mars Conspiracy
- Saturn's Rings Labeled
- Labeled Space Suit Designer
- Two Types of Black Holes
- Comet and Asteroid Difference
- Opportunity Mars Rover Timeline
Ganymede is larger than Mercury, which is the innermost--and smallest--major planet in our Solar System. The surface area of Ganymede is more than half that of the land area of Earth, and it provides scientists with a wealth of data concerning a great variety of surface features.
Most of the Big Whack theory was suggested in 1975 by Dr. William K. Hartmann and Dr. Donald R. Davis of the Planetary Science Institute in Tucson, Arizona. Their theory was derived from geological evidence that had been collected by the Apollo astronauts when they made their historic trip to the Moon in 1969. Oxygen isotopes within the lunar rocks were found to be almost identical to those on Earth. Furthermore, other pieces of evidence revealed that the Moon is partly composed of the same material as Earth's mantle.
However, when people ask whether mankind has the capability to go to the Moon again, unfortunately the answer is an absolute no. Even though mankind has much more advanced space technology as compared to 1960's; the current technology is not geared toward moon flight. In fact, even the US has lost the capability of the Saturn rockets due to the fact that production facilities have been dismantled. In time, even the know-how has become obsolete, as people who have worked in the Saturn program have retired or died. Hence, even if the US wanted to go to the moon today, a manned flight would be impossible for at least another decade.