What percentage of the universe is antimatter?

[Sorcerer]

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

[Mordred]

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

[Sorcerer]

I was meaning antimatter left over from the big bang.

[mathematic]

I was meaning antimatter left over from the big bang.

Very little, if any.

[Mordred]

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

[Sorcerer]

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?

[Strange]

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