Superman's greatest feats

[RyuHayabusa]

For those of you who have been long time Superman readers, what are the greatest feats you've ever seen him do? I seen him hold a black hole in his bare hand, survive nuclear blasts, etc. What are the greatest feats you've seen?

Also, what feats have you seen done in the past that, with modern understanding of science, are scientifically inaccurate or impossible?

[ShinDangaioh]

He once sneezed and blew out a sun in another galaxy.

[Super Monkey]

Also, what feats have you seen done in the past that, with modern understanding of science, are scientifically inaccurate or impossible?

all of them

Superman was just pure fantasy and pure fun.

Dispite that fact that Pre-crisis naysayers keep using it as an example I don't think that Superman ever starting Juggling Planets. Unless someone can show me proof, I will think of it as an urban myth.

[Uncle Mxy]

Also, what feats have you seen done in the past that, with modern understanding of science, are scientifically inaccurate or impossible?

He managed to lead a secret life wearing tights without being ridiculous, pulling the wool over 2+ nosy women, for decades.  

As for juggling planets, he'd rarely _juggle_ them AFAIK, but he'd jostle multiple planets around when it suited the plot.  I remember him tugging multiple planets around with chains without much effort.

[RyuHayabusa]

In one issue, Superman raced the Flash to the edge of the Milky Way, roughly 40,000 light years away. Now, considering the length of time for the race, Superman and Flash both had to be moving at hundreds of thousands times the speed of light.

I recently read the issue called "The Day The Cheering Stopped". Is this the only issue to feature the Sword of Superman? I've read elsewhere about something called the Sword of Destiny that Superman has in the future. Is this the same thing, or something different?