Look! Up In The Sky!

Jupiter, now the brightest object in the night sky after the moon, is growing a new red spot.  It's been visible to astronomers for a couple months now, but is growing rapidly right along side, and is already as bright as the original red spot which has been visible since telescopes were first turned toward it 400 years ago.  Why is that?  What forces and conditions caused the original and what is creating this new one?  Just for reference, Jupiter is as big as all the other planets put together.  The original red spot is so big several Earths could fit inside it.

And another thing.  It was a thousand years ago this week that the brightest star ever visible from our planet showed up deep in the southern skies.  We now know it was a supernova, but imagine the talk around the dinner tables back then when an object as bright as the moon suddenly appeared.  It was so bright it was visible in the daytime, and at night it was bright enough to  read by, for those few who could read back then. 

Seems like a lot of people can read now, but don't.  But there I go again.