Question:
WHY ARE WE ONLY WARNED NOT TO LOOK AT THE SUN DURING AN ECLIPSE,
BECAUSE OF THE DAMAGE IT COULD CAUSE YOUR RETINA
Replies:
It's almost impossible to stare at the uneclipsed sun long enough to do
damage to the retina; our reflexes make us shut our eyes and turn away.
So there's no real need for a warning about doing this. With the recent annular
eclipse, though: at places where there was only a ring of sun around the moon,
that ring may not have been bright enough to make a person look away before
damage occurred (perhaps a ring-shaped burn on the retinas). That was the reason for all the
warnings. In a true total solar eclipse, ALL of the sun is blocked by the moon,
and at totality it
IS safe to look directly at it. (By the way, there won't be a total solar
eclipse visible in the United States until the year 2017.)
NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.