Robittybob1

Strangely enough a glimmer of recollection did return once I had to focus that it was myself as being the source.

I help out many who know less than me, and appreciate help too from others, but I was getting excited by the topic and the two articles at the same time appearing that read like I thought it did. I'll re-read in light of what you've said. So in your simulation did you start Theia off from zero (or virtually zero)? I didn't say I agree what was written is this article other than it was "in a similar vein" to the one quoted the day before. It seems the writer is a bit confused as to when the mixing occurred. I will have to try and read the original work by the scientists from Maryland. Richard Walker maryland university. https://cmns.umd.edu/news-events/features/2944 https://www.geol.umd.edu/directory.php?id=21 That still does not eliminate mixing prior to the Earth and Theia forming in co-orbits. Has he considered that yet? Unless it is hidden in these words, the "Earth and the moon are very similar with respect to their isotopic fingerprints, suggesting that they are both ultimately formed from the same material that gathered early in the solar system’s history”. "Early in the solar systems history" would then be before the planet Theia collided with the Moon. I think I do remember writing that now. I was trying to clarify that a planet at the L3 position is not necessarily at exactly the same distance from the Sun (not on the same orbit) but close to it and hence in a region that while the material was in the protoplanetary dust disc stage it would have mixed sufficiently to be isotopically similar.

That might be the fourth option - senility and forgetfulness. Did I use that word and completely forgot that I did? Thanks.

But to counter that Janus explained it on the referred to thread and it was in context. So do the moderators change the words of a post and not tell us? That might be the third option miracle, mistake or alteration.

You can't be prejudiced like that in calling the officer "offending". He is doing his duty. But if they what to smear the evidence they would fire side-on to the victim if they intended to have less evidence in the case.

referring to http://www.scienceforums.net/topic/88515-how-to-calculate-the-force-of-gravitational-attraction-in-co-orbiting-planets/page-2#entry862974and the post above it. How did that sentence get into my post?

I have just re-read the post above that I wrote yesterday and I find the word "isotopically" in my post that I don't know what it means and it doesn't appear to be a spelling mistake. That seems to be a miracle if that is the right word used in the right context. Where and how did that word appear in my post? In fact that part sentence "they don't have to be on the same orbit but to be very close isotopically," is not what I understand or intended to write, so not only a word is inserted but a whole thought! What is going on? What does isotopically mean?

The evidence only worked in this case because the police did not know they were being filmed. With body cameras there maybe ways of standing side-on when firing so the film still doesn't capture the scene.

Well can't he still just keep on walking away?

I read that the Lagrangian orbits were calculable and that is why we know about them. It was proposing a hypothetical system with a perfect balance. Do you think even that situation will be incalculable?

Somehow you have to find a way of breaking that cycle. You fire 8 shots but how do you know if any have hit the CITIZEN? I did NOT see any shots being fired into the person while they were down. Maybe the whole idea of running after an offender is wrong. Are you allowed to run after someone and tackle them to the ground if they are running away? Are you allowed to punch them or taser them from behind? Corrections made.

Fair enough, but in a simple 2 planet system the orbits could be virtually circular, there might be nothing left to perturb the orbits. Just to be sure "Apocenter (1) away, Pericenter (2) close, and Focus (3). You might have the barycenters moving in the wrong direction? They usually relate the movement of the barycenter wrt the Star at the focus.

The point is that the whole idea of Theia involved an originally unstable planet, one that drifted close to the Earth. Looking at the horseshoe orbit an L3 planet could get into there are two points on that loop that get very close to the principle planet (the one that would be equivalent to the Earth). It wouldn't take too much more perturbation to simulate a collision. They don't have to be on the same orbit but to be very close isotopically, if they are made out of the same annular region of the protoplanetary disc they would be mixed thoroughly before accretion IMO and supported by the two recent articles. I had proposed this concept years ago and it is possible to alter (vary) the iron content in a situation like that as well.

I was harping back to my original idea that the 2 barycenters would move around the Sun, but once I had posted I realised your solution would be a solution but that was more the equivalent to the SS barycenter in this hypothetical 2 planet system.

Now that I have studied a bit about the Lagrangian Points one would wonder how the star could orbit the Sun-planet barycenter if there were two planets of equal mass both at the L3 position of each other.

You fire 8 shots but how do you know if any have hit the target? I did see any shots being fired into the person while they were down. Maybe the whole idea of running after an offender is wrong. Are you allowed to run after someone and tackle them to the ground if they are running away? Are you allowed to punch them or taser them from behind?

They say a taser had already been fired and there was a scuffle prior to the video. So he must have known he needs to comply. OK planting evidence and lying about giving CPR when none was given shows there was a lack of respect. The policeman needed to be sacked. But what are the police going to do to get compliance if everyone from now on just runs away? Would the words "Stop or I'll shoot" make the difference? These were the questions going through my mind when I first saw the video. No one in the news reports has mentioned what should happen in these situations as yet. Looking up "Stop or I'll shoot" on Google, I found a statement. Senior Assistant Attorney General Susan Morrell said: in http://reason.com/blog/2013/08/22/stop-or-ill-shoot-is-not-the-law-of-the Well that does answer my question.

Another article about the Moon formation in a similar vein to yesterday's article. http://www.irishexaminer.com/examviral/science-world/is-this-the-final-piece-to-the-puzzle-of-how-the-moon-was-formed-323087.html If it was formed from the same stuff where was it positioned? Was Theia at L3 Lagrangian Point or in one of these horseshoe orbits? Janus - in your simulation did you start Theia off at the L3 point from stationary?

Running away and fighting would be the wrong thing to do in any country, surely. As a youth I'd run from the police, but it wasn't without risk. It was the wrong thing to do for I was wrong from the start.

Have you looked at the documentary on the topic? I watch one on that topic yesterday and it detailed the sizes and the numbers. It is an enormous problem for an object of that size is really difficult to deflect. https://www.youtube.com/watch?v=0pF9ilPFBzs "ASTEROID Will Hit Earth in near Future 2015 "Doomsday Rock" (Full Documentary)"

The pressure and energy needed to push that object into the water tower will be greater that what you get from the falling side.

When was the last time there was a flying elephant landing near you?

not sure if I'd be allowed to do that! Where did you get that diagram from? Is that horseshoe shaped loop representing the path of the planet originally in the L3 position? The motions look wrong to me. Are you getting something similar on the simulator? Looks like someone else has done something similar judging from the headlines http://www.nature.com/news/puzzle-of-moon-s-origin-resolved-1.17279 Looking into horseshoe orbits I found this http://physics.stackexchange.com/questions/8340/how-do-horseshoe-orbits-work So I might have to get a computer to run that simulation. On both sides of the orbit there is a place where the smaller planet is accelerated faster than the larger one so the smaller one would be thrown to a higher orbit and slow down and the heavier one slow down and go to the lower orbit. But But But! On the side where they orbiting toward any gravitational attraction toward each other will slow the smaller (goes in and speeds up in a lower orbit) and speeds up the heavier (goes out and slows in a higher orbit), but on the other limb of the horseshoe orbit the lighter will be accelerated (goes out and slows in a higher orbit) and the heavier will be slowed (goes in and speeds up in a lower orbit). Those situations where an acceleration will slow something always confuse me.

What are the rules over there about talking to a police officer? Are you just allowed to run away and not expect to get shot?