Topic: Betwixt And Between | |
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hello you!
=0) the realm of this between the ether spirits whisper hello, and hello visits amongst the meeting places universal We some sent back more teachings there some stay awhile visiting love places love hearts, and touch others soar! newer levels yet, sweep to visit when we need a hand upon shoulders steady between all-where All are everywhere... |
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Janus and Epimetheus are "co-orbital". Janus' orbital radius from Saturn
is currently only 50 km less than that of Epimetheus. Since closer orbits have higher velocities the two moons must inevitably approach each other, and since Epimetheus' diameter is 115 km and Janus' is 178 km it would seem at first glance that a collision is also inevitable. But as the inner moon catches up with the outer moon their mutual gravitational attraction boosts the inner moon's momentum and raises its orbit, causing it to slow down. The outer moon, in turn, loses an equal amount of momentum and drops into a lower orbit at the same time, effectively speeding it up. The moons thus "trade" orbits and begin moving apart again, without completely overtaking each other and without even approaching each other closely (no closer than about 10,000 km). The exchange takes place about once every four years; the last close approach was on 21 January 2006 [1], the next will be in 2010. At that time, Janus' orbital radius will increase by ~20 km, while Epimetheus' decreases by ~80 km (Janus' orbit is less affected because it is 4 times more massive than Epimetheus). This arrangement is unique in the solar system, as far as is currently known. Maybe we won't crash. ![]() |
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lol!
another big boom, huh? |
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The Dancing Moons
May 3, 2006 In their orbital ballet, Janus and Epimetheus swap positions every four years -- one moon moving closer to Saturn, the other moving farther away. The two recently changed positions (the swap occurring on Jan. 21, 2006), and Janus will remain the innermost of the pair until 2010, when they will switch positions again. Although the moons appear to be close in the image, they are not. Janus (181 kilometers, or 113 miles across at right) is about 40,000 kilometers (25,000 miles) farther away from Cassini than Epimetheus (116 kilometers, or 72 miles across, at left) in this view. In fact, even when they are at their closest, tugging at each other and swapping orbital positions, they are never closer than about 15,000 kilometers (9,000 miles). The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 20, 2006 at a distance of approximately 452,000 kilometers (281,000 miles) from Epimetheus and 492,000 kilometers (306,000 miles) from Janus. The image scale is 3 kilometers (2 miles) per pixel on both moons. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo. This is so cool. I have never even imagined that moons dance. ![]() |
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oh, yesss....
headed out in a sec. good to see you, roy. ![]() |
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I remember when...and, then again
I forget the time went by not so long ago... Honor my past, carry it with me it is stamped on my skin like life's tattoo all things happen play out from within only hold onto that which we wake up for nene |
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winding clocks against
time spinning stars made new again braided threads strong many united hearts glow far Nene |
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Fell into a footprint on this day
Tried to see the way out Peered at the sky, far above.WTF!? Pondered what this was all about Circled the rim, again, and again Measuring distance to climb No way I'd make it in just one leap As I felt along walls like a mime "Who the hell made this print!?" I exclaimed WHAT could have? Just perplexed And, how did I miss such an awesome event? Oooh, another "moment!" Yup, so vexed To think what a mighty big thing must have left it And to fall such a distance unharmed Then, I heard,"WTF!? not too far away Someone else, like me, sounds alarmed "Hey you!" I yelled "Did you see what all happened?!" "You ought to know", the reply came from the other Stood there, mouth open, could not believe What pure nonsense, just, just...can a thought stutter? Looking around for route of escape I turned, seeking ways out Just as I saw some, relief, this I felt another WTF!? heard, one more shout Frozen in mid-step, and peering straight down Was I seeing this right, not mistaken? For every print that my step had made Some poor tiny soul just fell in! nene |
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