"G=EMC^2 Glazier" wrote in message
...
On average how big are they? What was the worse sun spot condition the
sun ever had since we have recorded them (taken pictures)? Could a
sun spot condition ever block the radiation of the sun from reaching the
Earth? I'm thinking that it is written in the bible that the sun
did not appear for a day. Could sun spots been the cause? Bert

"Our Sun has spots! These spots appear dark in photographs like the one
above, but in fact sunspots are quite bright - they are just dark compared
to the rest of the Sun. Sunspots are about the size of the Earth and
frequently occur in groups, as shown above. Sunspots occur when a
concentrated portion of the Solar magnetic field pokes through the surface.
This field slows energy from entering the sunspot region, causing sunspots
to appear cooler, darker, and lower than the surrounding surface. Sunspots
typically last a few days before dissipating. The number of sunspots is
always changing, generally going from a maximum to a minimum about every 5 ½
years. In fact, the Sun just passed a minimum two years ago. The Sun and
sunspots should never be looked at directly."
http://antwrp.gsfc.nasa.gov/apod/ap980322.html