The CAN DO team mounted 35mm cameras on the head ring of the KAO's 36 inch infrared telescope.
This was the first time anyone had attempted this type of photography from the airborne observatory
and no one expected them to work as well as they did. Even Nikon doubted that the F3, known for its
rugged nature, would function properly at -70 C in the nearly space-like conditions.
Astronaut Dan Burbank captured Comet Lovejoy from the International Space Station on December 21, 2011. Despite setting his Nikon D3S to an ISO of 12800, he still needed a steady hand for this 0.8-second exposure through an f/2.8 lens.
No results found for "venus from the international space station"
Think about this. Is that the 7 second exposure that exposes the whole game? Dollard is right, JL was right, only longitudinal waves travel long distances in the vacuum. The wavefronts can not be brought into focus by eye, with a regular camera, or the MOC camera, as it has very camera-like optics. It was designed to take stunning images that our eye would expect. Have I finally lost it all together, or can I get Dave to reopen the "stars can not be seen in space" thread?
The MOC Earth/Moon image has been specially processed to allow both Earth (with an apparent magnitude of -2.5) and the much darker Moon (with an apparent magnitude of +0.9) to be visible together.
The wavefronts can not be brought into focus by eye, with a regular camera, or the MOC camera, as it has very camera-like optics.
After 6 months of space flight, 7 astronauts had ophthalmic findings, consisting of disc edema in 5, globe flattening in 5, choroidal folds in 5, cotton wool spots (CWS) in 3, nerve fiber layer thickening by OCT in 6, and decreased near vision in 6 astronauts. Five of 7 with near vision complaints had a hyperopic shift ≥+0.50 diopters (D) between pre/postmission spherical equivalent refraction in 1 or both eyes (range, +0.50 to +1.75 D). These 5 showed globe flattening on MRI. Lumbar punctures performed in the 4 with disc edema documented opening pressures of 22, 21, 28, and 28.5 cm H2O performed 60, 19, 12, and 57 days postmission, respectively. The 300 postflight questionnaires documented that approximately 29% and 60% of astronauts on short and long-duration missions, respectively, experienced a degradation in distant and near visual acuity. Some of these vision changes remain unresolved years after flight.
GaryN wrote: That's very interesting Frank. From my own experience with looking at stars around here though,
I don't think it would make a difference to the stars being detectable. I need long distance
correction, but I don't normally wear my glasses, except for driving. I can still see the
stars, but they look much bigger and 'spiky'
"People have been flying in space for 50 years and nobody has gone blind yet," said Dr. Tom Mader, an ophthalmologist at the Alaska Native Medical Center, in Anchorage, who led the study. "But it's still something to be concerned about," he told Reuters Health.
Mader said the effects may be due to increased pressure of the fluid surrounding the brain -- the result of less gravity than on Earth -- that fails to drain well back into the body. But the precise mechanism is unclear.
It's possible that the loss of gravity causes pressure around the optic nerve to spike, which can damage vision, Mader said. It's also possible, however, that microgravity environments cause vision problems by lowering pressure in the eye, he added.
"It's very hard for us at this point to define exactly what is causing all of this," said Mader, whose group reported its findings in the journal Ophthalmology.
Spectacles and contact lenses correct "low-order aberrations", such as defocus and astigmatism, which tend to be stable in humans for long periods of time (months or years). While correction of these is sufficient for normal visual functioning, it is generally insufficient to achieve microscopic resolution. Additionally, "high-order aberrations", such as coma, spherical aberration, and trefoil, must also be corrected in order to achieve microscopic resolution. High-order aberrations, unlike low-order, are not stable over time, and may change with frequencies between 10 Hz and 100 Hz. The correction of these aberrations requires continuous, high-frequency measurement and compensation.
"In fact, researchers have been studying the use of polyethylene as a shielding material for some time.
One of several novel material developments that the team is testing is reinforced polyethylene. Raj Kaul,
a scientist in the Marshall Center's Engineering Directorate, previously has worked with this material on
protective armor for helicopters.
"Since it is a ballistic shield, it also deflects micrometeorites," Kaul says. "Since it's a fabric, it can be
draped around molds and shaped into specific spacecraft components."
It doesn't seem like we will ever do well in space in zero gravity. Seems like whenever I go to
take a look at the ISS daily activity, much of their time is spent testing to see how sick each
other are! Nothing on plasma experiments, or pictures from Pettits hot-rod camera. I wonder
what, and how quickly, we would become if we were to live and breed in 0 G? Adaptation, not
evolution seems to occur very fast.
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