posted on Jan, 13 2013 @ 01:39 PM
reply to post by wjones837
Greetings all, I stumbled across this video on Twitter, its a photographic animation of Cassini's flyby of Saturn, using only the images from the
craft, meaning there is no CGI or anything of that nature used, just a seamless mixture of the thousands of images captured by the craft.
They don't have cameras on Cassini that show us what it would look like out there to our eyes and those images they strung together are themselves
only artistic interpretations. There is no colour in the rings that you would see if you were out there where Cassini is. The Imaging Science
Subsystem (or ISS) has been around for quite a while now, CCDs instead of the Vidicon tube now though. They don't take video cameras I believe,
because there is so little light, and what 'light' there is could not be focused by the lenses in a stock video camera. It would be a waste of time to
take a video camera into deep space. NASA has always struggled with video in space, and the main tube in the early Apollo video cameras was
Classified. They had to get special permission to use them.
Also, light does not reflect off a gas, so even Saturn itself is only being seen by the specral emissions from the ionisation of gases in the
atmosphere. And when they say 'colour'm the accepted meaning of that is an image that uses 3 wavelengths of spectra, even if those wavelengths are IR
or UV or X-ray even. When they say the images are in visible light, they really mean the spectral emissions of the Methane, for example, are in the
visible portion of the spectrum, but they would not be visible to your eyes, it is the wrong type of light for our eyes to be able to detect, our
lenses, like a video camera lens, just won't register it.
Withe the famous Voyager "Pale Blue Dot" images, you will notice that the Earth was imaged when it was behind one of the rings (which would not be
visible by eye) as this is what makes Earth visible, rather than obscuring it. Very clever stuff, NASA. But where are the stars? Washed out by Earths
"What our cameras do is miraculous really. They convert the fleeting and indifferent fluctuations of electric and magnetic fields into powerful
emotion," Porco says. "Who can fail to be moved when seeing some of our beautiful images? Certainly not I."
So NASA employs how many artists now?
With Selene, I have been looking for specs of the HDTV camera, but not much available. I did see that it does a single shot, long exposure mode, so I
suspect that is how they got the video, it is not a 'real time' stream, but another animation.
edit on 13-1-2013 by GaryN because: Post text was missing. ?.