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Post by gonetoplaid on Aug 13, 2009 23:23:44 GMT -4
"Stars" staying in a video or CCD camera staying in the same position when zoomed would have to be hot or defective pixels in the CCD or video tube's array.
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Post by Sticks on Aug 15, 2009 11:59:17 GMT -4
Can someone help me with this video
It was posted as a response to mine
Where I did an experiment to illustrate the issue of exposure to explain why no stars appeared in the NASA images from the Moon.
So what is this other guy getting wrong here?
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Post by drewid on Aug 15, 2009 12:16:23 GMT -4
In the first shot the moon is massively overexposed. In fact it looks like the sun taken through a dark filter. In the second shot the moon shown (Enceladus) is also overexposed.
It's a very long way from the sun compared to our moon, approx 1 400 million km compared to 150 million km, so it's very dark out there. Enceladus has a very bright surface, but given the distance from the sun it still takes a very long exposure to overexpose it.
Ignore anything straydog posts, he's an idiot and it's not worth trying to debate with him.
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Post by drewid on Aug 15, 2009 12:31:58 GMT -4
The poster who thinks that this little moon has an albedo of 138% is getting his scales confused.
It's 1.38 (geometric) .99 (bond) or 99%. It's a little snowball in fact.
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