In a normal daylight condition - when you look at the Sun, your eyes reflexively squint and the iris closes to protect your eye from the direct sunlight. During an eclipse, the sky is sufficiently darkened that your eye does not react in its normal fashion. You will not squint, and the iris may actually dilate, or open up. The problem is that although the Sun will appear darker, you are still subjected to a flood of damaging ultraviolet radiation from the annular ring of still-bright sunlight. With no natural defenses, your eyes will be quickly damaged, as if they were staring at the Sun during full daylight and your eyes wide open. That is essentially what you would be doing, and it is very dangerous. You will not notice the damage until it is too late to do anything about it.
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This particular eclipse is called an "annular eclipse" because parts of the Sun are still visible. Although the sunlight will be dampened, or maybe even appears to be completely covered, the radiation from the sun is VERY dangerous to your retinas. If you've ever tried to stare at the sun, you know how it burns? It's NEVER okay to stare at the sun, even during an eclipse, it's not worth it to go blind or have some other permanent eye damage!
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The powerful rays hurts your eyes.
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The same reasons for goats.......BAH BAH BAH.........LOL