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ipfreely32
reply to post by Rob48
I love spot the difference! I can see a few differences in both pics (at least 3 besides the "assumed" module), possible meteor strikes, i dunno. Least it gets people thinking, and that is all i intend to do. This will allow someone with the correct resources to want to prove once and for all. Grainy pics with white dots will never convince me, therefore a part of of the population is also thinking the same thing, no fail :-)
Q: Could the VLT take a picture of the Moon-landing sites?
A: Yes, but the images would not be detailed enough to show the equipment left behind by the astronauts. Using its adaptive optics system, the VLT has already taken one of the sharpest ever images of the lunar surface as seen from Earth: www.eso.org... However, the smallest details visible in this image are still about one hundred metres on the surface of the Moon, while the parts of the lunar modules which are left on the Moon are less than 10 metres in size. A telescope 200 metres in diameter would be needed to show them. Although the VLT, when used as an interferometer (VLTI), reaches the same equivalent resolution, it cannot be used to observe the Moon. You may be wondering whether the Hubble Space Telescope would have better luck. In fact, while a space telescope is not affected by the atmosphere of the Earth, it is not substantially closer to the Moon. Also, the Hubble is smaller than the VLT, so it isn’t able to obtain images that show the surface of the Moon with higher resolution. The sharpest images of the lunar landers have been taken by the Lunar Reconnaissance Orbiter
cestrup
reply to post by Rob48
According to an ESO Press Release, scientists working at The Very Large Telescope (VLT) array in Chile “were able to see details on the scale of one milli-arcsecond, corresponding to being able to distinguish, from the Earth, the headlights of a car on the Moon”. 1 milli-arcsecond is 0.001arc-seconds. This means the Very Large Telescope is perfect to resolve man made equipment left behind on the lunar surface. Indeed, in a 2002 Daily Telegraph article, Dr. Richard West stated that he would use the VLT to try and resolve the Apollo artefacts, but so far no luck.
This is from Jarrah White's website. I can't claim that this is true but this is where I got the information about the telescope. Hey, I was at least right about it being from South America.
Yes, I realize you despise JW but I'm just using this quip because of the telescope clarification.
ipfreely32
reply to post by Rob48
I love spot the difference! I can see a few differences in both pics (at least 3 besides the "assumed" module), possible meteor strikes, i dunno. Least it gets people thinking, and that is all i intend to do. This will allow someone with the correct resources to want to prove once and for all. Grainy pics with white dots will never convince me, therefore a part of of the population is also thinking the same thing, no fail :-)
Q: How does the VLT Interferometer (VLTI) work?
A: The power of the VLT Interferometer does not come from adding the light beams from the individual telescopes to gather more light. Instead, the light waves are made to interfere with each other to produce patterns of light and dark fringes, a little like the way ripples on water can combine to produce either bigger waves or cancel to produce calm water. This technique is called interferometry. The fringes give us information about the structure of the observed object, but they are not an image of it. If an image is needed, it must be reconstructed by mathematically combining the information from many sets of fringes. However, many important scientific questions can be answered without making an image of an object. For the interferometry to work, the light waves must be combined very precisely using a complex system of mirrors in underground tunnels. The paths along which the light travels must be kept accurate to a fraction of the wavelength of the light, to control the phase of the waves. The accuracy required in positioning the mirrors is less than 1/1000 mm over a hundred metres. Thanks to this technological feat, the VLTI can reconstruct images with an angular resolution of 2 milliarcseconds, and allow astronomers to see details up to 16 times finer than with the individual VLT Unit Telescopes.
"This result could only be achieved because of the great details we could observe with the AMBER instrument combining three 8.2-m Unit Telescopes of ESO's VLT," said Philippe Stee, leader of the team that performed the study [1]".
With AMBER on the VLTI [2], the astronomers were able to see details on the scale of one milli-arcsecond, corresponding to being able to distinguish, from the Earth, the headlights of a car on the Moon.
Dr West said that the challenge pushed the optical abilities of one VLT mirror to its limits: if this attempt failed, the team planned to use the power of all four mirrors. "They would most probably be sufficiently sharp to show something at the sites," he said.
Although the VLT, when used as an interferometer (VLTI), reaches the same equivalent resolution, it cannot be used to observe the Moon.
I have worked with Richard for some times (he was my thesis supervisor almost 20yrs ago) - the least I can say is that he was a very very careful gentleman, and that he very seldom issue anything like a bold statement. I can of course not claim he did not actually say that, but I have a suspicion that the journalists might have ... extrapolated a little what he said. This particular journalist does not strike me as very accurate (cf the notes in the above texts about the factual errors).
In any case, I am really sorry, but the observations would not work, if they were ever attempted. It is one of the most frustrating issue with interferometry: it works well only for small things on a dark background. Anything extended adds noise, but no details can be seen on it.
The first attempt to spot the spacecraft will be made using only one of the VLT's four telescope mirrors, which are fitted with special "adaptive optics" to cancel the distorting effect of the Earth's atmosphere.
The problem is that VLTI works only with "coherent sources" - in short, the light must come from very sharp objects (like a very distant star), and does not work with extended sources (like a patch of lunar soil). So, when we now refer to the Moon as an example for VLTI, we say "we would be able to distinguish the 2 headlights on a lunar rover" (as these are 2 sharp sources).
No, JW got that from the horse's mouth. This is from a press release:
"the astronomers were able to see details on the scale of one milli-arcsecond, corresponding to being able to distinguish, from the Earth, the headlights of a car on the Moon."
cestrup
reply to post by Rob48
No, JW got that from the horse's mouth. This is from a press release:
"the astronomers were able to see details on the scale of one milli-arcsecond, corresponding to being able to distinguish, from the Earth, the headlights of a car on the Moon."
amber.obs.ujf-grenoble.fr...edit on 15-4-2014 by cestrup because: (no reason given)