Originally posted by JimOberg
Originally posted by easynow
Jim Oberg say's in this video the Astronauts were tossing out junk and junk tends to Zig Zag back and forth. (in the vacuum of space)
can junk "Zig Zag" in the vacuum of space ?
When an object in orbit departs from a point of origin in a direction more-or-less perpendiclar to the original object's direction, it moves away
at first but then curves back and returns to the area of origin. Over a period of several orbits it passes back and forth -- it zig-zags -- across
That's why departing objects of any kind need to be observed for their motion in case there's a chance of recontact. This has always been true on
space missions and is still true to this day.
The flight path looks like a zig-zag.
I'm a little late on that issue, but Jim Oberg it is the right when described the bolded statement, about objects moving out and then returning back
along the orbital path.
Here is an experiment i've done:
I used "Gravity" (www.uranisoft.com...
), a software which simulate the motion of a number of objects influenced by their own
It already has in it's database, the Earth, the moon and other objects.
What i've done, was to use 4 objects:
*Shuttle - an object at about 300 km altitude, having a speed 8000 m/sec
*debris1 - a small object suddenly (at moment T) going out from the shuttle perpendicular, toward the Earth, so going down
if you want, going
away from the shuttle with just a relative speed of 0.1 m/s
*debris2 - another small object suddenly (at the same moment T) going out from the shuttle perpendicular, AWAY from Earth, so going up
want, going away from the shuttle with just a relative speed of 0.1 m/s
Then i recorded the entire motion, during two revolutions around the Earth.
The animation below shows only shuttle, debris1 and debris2 objects, the Earth is too big and further away to fit on screen.
Also, the entire motion is stick to the shuttle, so the shuttle appears on the center as static. This way, we have the shuttle as reference point, and
we will see only the relative motion of the objects in orbit.
The green lines, are the vectors of gravity force of the Earth. So, the green line, points to the center of the Earth.
The red lines are vectors of speed, showing the direction (and size) of the speed relative to the Earth (about 8000 m/s with variations due to motion
The zoom factor is 1, meaning one pixel on the screen represent 1 meter.
Again, the animation shows only two revolutions around the Earth.
And here is the animation:
As you see, indeed, the two objects are going away and before respectively after the shuttle for some time for half an orbit or so, then, they go
back to the shuttle.
Indeed, motion in orbit could fool us, the novices.
Of course, in reality, there are other forces which could affect the motion, for example atmospheric drag which could influence differently different
now, back on those transcripts.
[edit on 5/10/09 by depthoffield]