Is some of the universe still antimatter and will it all eventually encounter matter and annihilate.

Antimatter is formed regularly, however it is short lived and is quickly annihilated from encountering normal matter.

http://www.wired.com/2011/08/earth-antimatter-belt/

 

Not the best link but it shows antimatter via cosmic rays

I was meaning antimatter left over from the big bang.

I was meaning antimatter left over from the big bang.

Very little, if any.

I was meaning antimatter left over from the big bang.

Not any from BB. They would be annihilated the only antimatter today is recently created. Even then incredibly short lived

Is there good evidence to support this or is it a prediction?

 

How do we know if other galaxies are made of matter or antimatter?

 

How do we know that there isn't lone antimatter drifting in voids?

If there were clouds or galaxies of antimatter then there would be a point where they meet interstellar matter - this would cause distinctive radiation. There have been, and are, experiments to look for this, but so far the evidence isn't there.

For example: http://science.nasa.gov/science-news/science-at-nasa/2009/14aug_ams/

 

But they have found all sorts of interesting things. For example:

http://www.nasa.gov/centers/goddard/news/topstory/2007/antimatter_binary.html

http://www.nasa.gov/mission_pages/GLAST/news/new-structure.html