brightness of Venus |
brightness of Venus |
Dec 21 2007, 07:28 PM
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#1
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Junior Member Group: Members Posts: 91 Joined: 21-August 06 Member No.: 1063 |
I was wondering.
If Venus reflects 70 percent of the sunlight that hits it. If I was in spaceship on approach to that planet could I look at it with the naked eye out the window and not get blinded? Would I have to at least use sunglasses? I am wondering to how much brightness reduction is going on when processing the images before they are release to public or analized. thanks |
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Dec 23 2007, 10:31 AM
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#2
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
Something I've worried about is a hazard when you go beyond Earth's orbit. Sun-blindness.
People with normal eyes can look at the sun. Staring at it's bad, but evolution's prepped us to be able to glance at it or have it in our peripheral vision without frying our retinas in a hurry. When you go out to Mars orbit and beyond.. the sun gets smaller.. and dimmer... but not with any lower surface brightness. As you get out to the belt and Jupiter's orbit, the sun's getting really small, with a total angular-arc-minutes of area like the sun during the near-total stages of a solar eclipse... THE ONES WHERE PEOPLE FRY THEIR RETINAS!. The problem is that as total brightness drops, the iris starts to open a bit from sun-safe maximum constriction.. and the brightness per square micrometer on the retina rises to "sizzling" levels. People exploring beyond the sun may need active, smart eye-tracking, eye-shielding self-opaquing optics in suite helmets and the like, and windows that automatically darken or blur when the sun is visible. |
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