It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
You see, discussing such scientific issues with Mr. Lear becomes quite pointless after a while, because he is unable to discuss these things at all.
Originally posted by johnlear
Uh, I was just wondering, do you have an opinion on what the 'neutral point' is between the earth and the moon? (please express it in miles from the moon, thanks). I know I asked you this before but you may have forgotten.
If you don't know it, or can't find it out please just say 'no'. No more lengthy dissertations trying to bambozzle your way out of giving us a straight answer. Thanks.
I'm not seeing anything when I search that date through their site. Do you have a link to the image?
But, I believe, you're looking for their center of gravity, correct?
For the umpteenth time: The point which best fits what you call a "neutral point", is the Lagrangian L1, at ~38,000 miles from the moon. Calculated using the established parameters (masses[*], distances) of the Earth-Moon system.
Originally posted by johnlear
Originally posted by Rren
I'm not seeing anything when I search that date through their site. Do you have a link to the image?
As with many NASA and Lick Observatory photos with incriminating evidence this photo is in short supply. The best place to find it is in books with photos of the moon published prior to the early 70's.
I am looking for the exact point in space, between the earth and the moon, where an object such as an Apollo spacecraft would experience neutral or 'equal' pull of gravity of both bodies.
For discussion . . .
As the Appollo missions left the Earth's orbit and headed to the Moon, their speed was about 24,000 miles per hour. The engines were off. By the time they reached a point 30,000 miles from the Moon (37 cm from the model Moon), they had slowed to 2,000 miles per hour. From that point on, they began to speed up once again. The reason for this is that, at first,the crafts were slowed by the pull of Earth's gravity. That point (30,000 miles from the Moon) is where the pull of the Earth and the Moon are equal. Once past that point, the crafts began to speed up once again because of the net force caused by Moon's gravity.
Source
[Emphasis- Rren]
For a smaller body (the Moon) orbiting a larger body (the Earth), there are 5 points where rotational forces and gravitational forces acting on a spacecraft cancel out. The L1 point is where the Moon's gravity plus centrifugal force cancels the Earth's gravity. If we launch a spacecraft on a Hohmann transfer trajectory from the Earth to the Moon and aim it at L1, it will actually complete a figure-8 orbit of the type discussed above. Similarly, a spacecraft placed near any of the other 4 points will tend to hover there. The L4 and L5 points are on equilateral triangles at the same distance from the Earth as the Moon, but 60 degrees ahead and behind the Moon. They are more stable than the other 3 Lagrangian points, and some space advocates have suggested these as natural locations for human space colonies.
Originally posted by yfxxx
Originally posted by johnlear
Uh, I was just wondering, do you have an opinion on what the 'neutral point' is between the earth and the moon? (please express it in miles from the moon, thanks). I know I asked you this before but you may have forgotten.
This is becoming surreal ... I'm beginning to feel like Bill Murray in the "Groundhog Day" movie!
Originally posted by MrPenny
I'm not a mathematician, but I play one on the Internet.
Somewhere in there is a serious flaw. The Lagrange point is the result of a formula, using already determined masses for the planetary bodies. And I think, its determined by figuring the gravitational affect on a body at that point, and not so much their affect on each other. I'm pretty sure a third body must be included in the formula.
So you want to go backwards, starting with the result of a formula using established values, and discredit it by arriving at different values with a different formula? If that's the case, it throws the validity and accuracy of your formula into doubt also.
I'm thinking on the fly here. Can you tell?
Originally posted by johnlear
Now if assumption of planetary mass had the La Grangian point at 30,000 miles and the actual point at which the spacecraft experienced neutral was 43,495 who is in error? The assumptions of mass? Or those idiots in the Apollo spacecraft and idiots at Houston Space Tracking Center?
Who's saying the 'actual point' is 43,495 miles?
That appears to also be an assumption, owing to the fact that I have in a very short time seen the neutral point as 24,000 miles or 43,000 miles, and the Lagrange Point as 38,000 miles (not the 30,000 you efficiently rounded down to).
Does anyone know what the hell anyone else is talking about here?
This is a fun mind exercise, but I think it only points out that, given a choice of variables, (none of which seem to be agreed on), a result that makes you (hypothetical "you", not you) and your (redux) theories happy is inevitable.
And the preceding sentence is a semantical version of the maths being tossed around here.
Originally posted by johnlear
There can be only one 'neutral point'. All you have to do is decide what it is. Is it Wikepedia 30,000? Is it 24,000? Is it yfxxx 38,000. Its really very simple. Just choose one.[...]If you think it is bad now, Mr.Penny, wait until you choose a neutral point and we get into the actual math. Don't give up now, please.
In short, your opinion (I know, and von Braun's, the Apollo crew...et al....) of the neutral point at 43,000 miles may only be valid for that single Apollo vessel, and flawed dependent on the amount of food they toted (affecting its mass).
Originally posted by johnlear
its good for any weight. Any amount of food. Any Apollo vessel. Its THE neutral point between the earth and the moon.
So in conclusion, you want to determine the mass and gravity of the moon, by using a formula and/or scenario that ignores the mass of a third, moving object?
And you successfully piloted aircraft?
You're entitled to your opinions, you're even entitled to air those opinions....having done so, I feel free to tell you.....its poorly thought out and logically flawed.
Originally posted by darkbluesky
Where is all the He+3 currently being mined on the moon being sent and what's it being used for?
The dipole magnetic field is the simplest and most common magnetic field configuration in the universe. It is the magnetic far-field of a single, circular current loop, and it represents the dominate structure of the middle magnetospheres of magnetized planets and neutron stars. The use of a dipole magnetic field generated by a levitated ring to confine a hot plasma for fusion power generation was first considered by Akira Hasegawa after participating in the Voyager 2 encounter with Uranus
Originally posted by yfxxxSo, look for the eroded craters. I'm sure you'll have no difficulties at all finding some,
Originally posted by MrPennyIn short, your opinion (I know, and von Braun's, the Apollo crew...et al....) of the neutral point at 43,000 miles may only be valid for that single Apollo vessel, and flawed dependent on the amount of food they toted (affecting its mass).