Sunlight

Jun 1, 2020
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One would have to go well beyond Pluto to be able to see the Sun directly and comfortably. It's that bright! Sometimes particle counts in our atmosphere can diminish sunlight by a factor of 10,000 or more, allowing comfortable viewing of the setting Sun's disk. [But it's unwise to view it for more than a few seconds since the IR level is extremely high. Looking through glass greatly helps.]

Mars, at 1.532 AU, will receive less than 1/2 the sunlight (per sq. meter) as we do, but it is still very bright on Mars. The thin atmosphere likely will bump this value to very close or slightly above 1/2 at the surface compared to Earth's surface.
 
Jan 22, 2020
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Sun/star=contraction/deflation(Newton G heavy) initiates expansion/inflation(Einstein E attenuation) much compromise(orbits)=structured matter of mostly space with variant mass(fused/forged by mega critical mass-stars and cataclysmic collisions) ultimately from initial mega mega mega mass density relative to our "normal." Some type of very elastic tubular electro fabric/media base. Results in sliding scale combos with variant static existence as solid, liquid, or gas(non-living) or combo(living) with continuing interactivity of E and M, different oxidative/reductive gradients.
 
Jun 1, 2020
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Yep. But -19 (-19.3) is still too bright because the surface brightness of the Sun is unchanged. Only going past 30 AU will that 1 sq. arcminute start to become more dim than any 1 sq. arcminute we would see from space of the Sun at 1 AU.

After about 100 AU, with a 10,000 factor reduction (so -16.7 mag.) will it likely be tolerable but still very bright and brighter than a Full Moon (-12.67).

It's certainly possible that a greater distance is required. I have yet to see clear data on the photopic thresholds for the eye.
 

COLGeek

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Apr 3, 2020
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Why do i see a shadow under helicopter? Is there a sun on mars ? Or is it the same one we have?
I suggest you spend a little time here:

 
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Jan 22, 2020
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Light=energy=variant excited particle or variant electromagnetic wavelengths focused through and by a lens on the rods and cones/retina at the rear of the eye. This increase pressure in the cells at the rear of your eye from collisions (creates variant levels of cell subatomic excitation=kinetic energy movement). Occurs from any and all light sources. Brightness=greater excitation/energy=greater cell expansion. The amount of energy and exposure time combine to produce the cell expansion which if any combination is long and/or high enough will cause cell rupture and vision impairment. This includes screens of all types as they are of higher energy hence brightness. Think of it as microwaving your eyes hence look away every 20 minutes/ The sun is emitting immense radiation or high energy particles or wave lengths therefore can solidify the retinal cells very very quickly if no attenuated. The macula acts qs an energy sink to dissipate the pressure in the retinal cells. This is why lutein and zeaxanthin molecules are so important in the health of the macula and eye as they are of an atomic structure to facilitate this energy/heat/cell pressure dissipation. Anything beyond "normal" and "normal" is relegated to not just intensity but time. All essentially energy interphasing. Have a great day.
 
Jan 22, 2020
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It varies with time and level of energy mostly brightness. Other factors are macular condition which is very closely related to lutein and zeaxanthin intake. These are in the orange, red, yellow, dark green veggies. Keep the glucose/carbs low. There are others. Translate this into plants are a plethora of molecules that fine tune the polarity/magnetism/electromagnetic mass effect of the sub atomic/atomic patterns and sequences at an unbelievably small variant forces and distances all related to Newton's G=mM/r2 which is skewed by direct physical observation which is where Einstein's E=mc2 enters as a corrective attenuation(energy), but at these distances although relative to size as well for the larger macro environment we experience in the real world are close to negligible but summative the do start to have an impact again proportionate to time and duration hence moderation but varies. Ultimately this is what all healthy or illness is about. Observations have been made that within minutes after administration of lutein and zeaxanthin reticula cells shrink as the excess energy removal occurs via the macula inclusion. There are more beneficial actions to be taken. Would not look at any high energy sources without complete safe attenuation. Looking directly at a high energy/radiation source i.e. over excited/charged atomic components. I have an excellent optometrist connected to various sources who is devoted to sight research and preservation for some of this data. The internet has a plethora of info. Do your diligence i.e. bibs. location, etc. for authentication and validity. Things do change. The tissues require optimum concentrations of similar molecules, but due to their variances in function also need greater and lesser molecular structures specific to those requirements. The eyes are probably the most delicate and diverse in structure along with the accompanying neuro processing. Mostly, if not all about electro mechanics even the nuclear. Expansion/contraction forces much like the magnetic interesting adventures of youth when finding a magnet just relatively unbelievably small micro to the same at macro levels. Simply mass effect related to density/area causing inflation/expansion and contraction. Have a great day.
 
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