Optics Motorized

What are the physical limitations that prevent the build of a telescope that could find alien life visually?

Can someone please explain why the hubble can supposedly take pictures of distant galaxies, yet it can't focus in onto the surface of distant planets? Why can't we develop a motorized telescope to systematically scan space rocks visually for signs of movement that would indicate life? Why can we in one sense see so far, yet in another we can't even visually scan someone as close as mars from earth without a remote camera? What prevents a telescope from being able to point with accuracy? I realize it's a physics/optics/light issue.... is it also financial, or is what i'm describing impossible.

There are new technologies coming on line all the time. In considering a question like yours I find it risky to say "that can't be done"... let's rather say "that can't be done - yet."

They have a way to place telescopes 1 mile apart and combine the images in a computer in such a way as to make it look like a single telescope *1 mile across*. That's impressive. They also now have adaptive optics which make ground-based telescopes almost as clear as Hubble. Clearly if you aim far enough into the future the sky's the limit.

Now about looking for aliens. From the moon there is no sign of intelligent life on Earth. We can expect the same elsewhere. To see cities or such we'd need a view equivalent to being in low orbit around their planet. That's a lot to ask. I'm not saying it won't ever be possible, but it would involve technologies we haven't thought of yet. But your grandparents would have said the same thing about Hubble, so keep looking up!

Optics $99.25 Optics gives a comprehensive and balanced account of traditional optics as well as some of the recent developments in this field while meeting the requirements of a course on optics meant for undergraduate students of science and engineering.

Orion SteadyStar Adaptive Optics Guider with Rotator $1999.99 A new way to autoguide and track, the SteadyStar AO Guider with Field Rotator is a powerful and versatile companion to your telescope, mount and camera. The built-in Field Rotator allows you to move the SteadyStar's off-axis prism to locate a guide star or to change the imaging camera orientation. It also enables long exposure imaging with motorized altitude-azimuth mounts. And with the fast adaptive optics guiding, it turns any image capable mount (Alt-Az or EQ) into a more effective one, yielding better tracking. The SteadyStar AO Guider with Field Rotator not only makes rapid and accurate tracking corrections to deliver pinpoint stars, it also allows you to rotate the camera and off-axis guider without disturbing the focus. That makes finding a guide star much easier. Additionally, the SteadyStar AO Guider with Field Rotator is an ideal solution for imagers with fork altitude-azimuth mounts, including those used with popular catadioptric telescopes. Since Alt-Az mounts cannot move in arcs to match the apparent movement of the sky, the field rotator will do that for you. There's no need to purchase a heavy equatorial wedge for your fork mount. The SteadyStar's broad compatibility works with most cameras including any Orion CCD camera as well as DSLRs, and most autoguiders including the StarShoot AutoGuider. A filter wheel can be added between the SteadyStar and imaging cameras without adding to the backfocus.

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Lego fibre optic + micro motor

Symptoms Of Multiple Sclerosis?

Multiple sclerosis affects the CNS.

The central nervous system is the one that controls most, if not all, of the body's activity and optimal functioning. Just a minor damage to the central nervous system or the CNS can produce a very wide range of symptoms. Multiple sclerosis is only one of the diseases that can result from the damaging of the central nervous system.

Most of the symptoms associated with multiple sclerosis are very unique. But having one of the symptoms does not immediately lead to the diagnosis of multiple sclerosis, there has to be a collective onset of symptoms. Still, however, each and every one of these symptoms could be very life-threatening and deserves medical attention as soon as possible.

Visual symptoms

Optic neuritis is one of the multiple sclerosis symptoms that affect the person's vision. It consists of an inflammation with an accompanying demyelization of cranial nerve number two which is the optic nerve. There is a blurring of the vision, loss of some, if not all, of the visible color, loss of visual acuity, complete or partial blindness, and its pathognomonic sign which is pain behind the eyes.

Another visual symptom is diplopia, which is only a medical term for double vision. Lesions that occur within the brainstem cause this double vision. It is unfortunate for those with multiple sclerosis that the brainstem is affected because it is where the cranial nerves for eye muscles are located, specifically the sixth cranial nerve or the abducens. In multiple sclerosis, the nerve that operates the lateral rectus muscle is affected, thus, pulling the eye outwards.

Nystagmus is yet another visual symptom associated with multiple sclerosis. It is the rapid and involuntary movement of the eyes. This symptom is predominantly obvious to others but is not immediately noticeable by the person with the complaint. It is like riding on a bus where the scenery just zooms past by.

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Motor symptoms

Multiple sclerosis causes paresis within the individual. It is simply a medical term for partial or mild paralysis that is usually described as muscle weakness. According to research and studies, this muscle weakness is caused by the lesions that are formed along the motor nerve pathways.

Spasticity is comprised of involuntary muscle contractions that are not coordinated with the movement of the other muscles. In multiple sclerosis, the normal pattern of reverse contractions that occur between muscles is disrupted, which further leads to the contraction of many muscles at the exact same time. Since the transmission of sensation and control messages are not properly sent to the receiver, the muscles receive information and sensory feedback that is not at all appropriate.

Dysarthria is the medical term for speech problems. In multiple sclerosis, the muscles that are involved in controlling speaking or the nerves that control the corresponding muscles are destroyed. The resulting muscle weakness and incoordination give rise to dysarthria.

Sensory symptoms

Paresthesia is described as a collection of abnormal sensations in just about every part of the body. It is composed of prickling, tingling, electrical-type buzzing, skin crawling, burning, or itching of any random part of the body. Paresthesia is most commonly referred to as pins and needles with the accompaniment of partial numbness and a variety of neuropathic pain.

Another sensory symptom associated with multiple sclerosis is the L'Hermitte's sign. This is basically the electrical buzzing sensations that occur in the limbs and the body that is brought about by any movement of the neck. When the person with multiple sclerosis lowers the head part in a way that the chin touches the chest, L'Hermitte's sign is triggered.

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