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h e B i g B a n g
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Before
I start I just want to let you know that all the information here
is just theories. The reason I'm telling them to you is because I
believe this is the best explanation and most accurate scientists
currently have.
Approximately 15 billion years ago all
the matter you feel and see was created in a "big bang".
It exploded out of nothing and there was nothing there before it.
Most elements can be derived from hydrogen, but where did the hydrogen
come from? It was suggested that it could be created with a colossal
high temperature from subatomic particles. Some finds that back up
the big bang are; the universe is still expanding and there are still
slight variations in the temperature in space to suggest that space
is still cooling.
It all
begins with a dramatic big bang producing nothing but tremendous heat.
As the heat spreads out slight variations occur. The hot spots start
to convert into particles and antiparticles. The slightly cooler ones
become the first voids in space. These particles start to be drawn
together by gravity by a electromagnetic force to make them combine.
Most of the anti-matter is lost in annihilations leaving only matter swirling
around in clumps. It takes 300,000 years for space to cool down enough
for electrons to combined with the nuclei of the subatomic particles
to form the first atoms. It takes 1,000,000,000 for enough helium
and hydrogen atoms to clump together to form the first cosmic bodies
(typically whole galaxies). And the rest is history.
3 seconds after the big bang there is
only exotic particles and energy, 3 minutes there are protons and
neutrons, 300,000 years there are clouds of hydrogen and helium atoms,
1,000,000,000 years there are stars and protogalaxies. and 15,000,000,000
years later and we're at present day.
We can look back into the past by taking
a galaxies red shift (Doppler Effect). Taking it's light and placing
it on the light spectrum. The more red shift the farther back in time
and farther away the galaxy is. This helps us get closer to what the
universe looked like at the time just after the big bang. It also
helps us study galaxy formation.
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