the sun is so bright, its a big ball of gas. if you stare directly at it it could damage your eyes permanently. I suggest you dont look at the sun and if you do, dont look at it too long, you may go blind
For one thing, it hurts. That should be enough for someone to figure out that it's not good for you. But if it's not, then I can say this - any exposure to sunlight adds to cumulative effects of UV radiation, which has been linked to eye conditions such as macular degeneration.
It can damage your eyes causing permanent blindness if stare at it for far too long. Trust me it almost caused me to go blind when I stared at it for I don't know how long, but everything went black for a little bit and I started crying thinking I were blind. LOL -___-