Origin of Matter
If matter cannot be created or destroyed,
where did the first(present)matter come from?
Though, it is still a big question, if the "Big Bang" was
reasonably symmetric the universe should have started out
as pure energy, or as equal parts antimatter and matter
(matter can be destroyed and turned into pure energy by
combining it with antimatter, and energy in some other
form can be converted into equal parts of matter and antimatter).
The big question is, why do we normally only see matter around
us, and not equal parts of both matter and antimatter? (Of
course it would be pretty hazardous living around stuff that
could annihilate you!). There are a bunch of theories, but as
far as I know, nobody really knows yet.
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Update: June 2012