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United States News
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Title: Can you really go blind by staring at the Sun?
Source: [None]
URL Source: http://www.sciencefocus.com/qa/can-you-really-go-blind-staring-sun
Published: Aug 21, 2017
Author: Steven A Collins
Post Date: 2017-08-21 10:54:04 by no gnu taxes
Keywords: None
Views: 7146
Comments: 21

It’s possible, but the hazard is often exaggerated. Even at midday, a normal eye will only let in enough light to heat the retina by about 4°C. You need at least 10°C to cause thermal damage. Looking at the Sun during an eclipse for more than a minute can cause damage, because your pupils are more dilated during this, but it doesn’t result in total blindness and isn’t usually permanent. If the Sun is within 10 minutes of setting below a sea-level horizon, the more dangerous short-wavelength light is absorbed by the atmosphere and it should be quite safe to look at the Sun.

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Begin Trace Mode for Comment # 15.

#5. To: no gnu taxes (#0)

Dunno 'bout that - but worse things can happen if the gods don't signal their appeasement by making the Sun go dark...

VxH  posted on  2017-08-21   12:39:32 ET  (1 image) Reply   Untrace   Trace   Private Reply  


#14. To: VxH (#5)

A very good movie. As was the Passion of the Christ.

misterwhite  posted on  2017-08-21   19:02:01 ET  Reply   Untrace   Trace   Private Reply  


#15. To: misterwhite (#14)

Yeah. The "happy ending" was the arrival of the Spanish! Jeez Louise!

Vicomte13  posted on  2017-08-21   19:12:56 ET  Reply   Untrace   Trace   Private Reply  


Replies to Comment # 15.

#16. To: Vicomte13 (#15)

Yeah. The "happy ending" was the arrival of the Spanish! Jeez Louise!

Not sure if you're being sarcastic, but I'm sure the Spanish arriving at the end was not intended to be a happy ending. As per the movie title, it was more a revelation that the warring factions, while fighting amongst themselves, were oblivious to a greater threat that made their differences insignificant. It was an illustration of foolishness, and a message perhaps intended for the contemporary world.

Pinguinite  posted on  2017-08-22 02:24:32 ET  Reply   Untrace   Trace   Private Reply  


End Trace Mode for Comment # 15.

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