Big Bang
The universe contains everything
that exists: Earth, the Sun, the stars, galaxies (collections of billions of
stars), and everything else in space. People have wondered how the universe got
started for thousands of years. Most scientists now think they have the answer.
They think the universe began about 14 billion years ago with a kind of big
explosion. They call the explosion the big bang.
WHAT HAPPENED AFTER THE BIG BANG?
No one knows what caused the big
bang, but scientists think they know what happened all the way back to the first
seconds after the big bang.
The brand new universe was very hot
and very small. It blew outwards very fast. In the first three minutes, matter
started to form. Hundreds of years later, the universe looked like a big ball of
fire.
You can picture the universe as
something like a black balloon with white dots painted on it. The black
represents space and the white dots are galaxies. Blowing air into the balloon
makes it bigger. The spaces between each dot get farther apart as the balloon
expands.
As it got bigger, the universe got
cooler. Hydrogen gas formed. The gas broke into clumps. The clumps came together
to make galaxies and stars. Other kinds of matter formed in the stars. Finally,
planets like Earth formed around some stars.
IS THERE PROOF OF A BIG BANG?
The expansion of the universe is
evidence for the big bang. American scientist Edwin Hubble studied light coming
from galaxies far out in the universe. In 1929, he found that the galaxies were
speeding away from Earth and from each other in all directions. Scientists
tracked the paths of the galaxies back to their starting place. They saw that
all the galaxies must have started from the same place. Packing all that matter
into a small area would make a very dense, searing hot ball—the big bang.
Scientists use math to describe
how the universe behaves. In the early 1900s, German American scientist Albert
Einstein came up with equations that predict an expanding universe. These
equations have correctly predicted the motions of stars, planets, and light.
More proof came in the 1990s from
a spacecraft called the Cosmic Background Explorer (COBE). COBE saw rays coming
from far off in the universe. The rays are left over from the early days of the
universe. They could only have been created in a much smaller and hotter
universe long ago.
WILL THE UNIVERSE KEEP EXPANDING?
Scientists are not sure what will
happen to the universe. They currently think it will keep expanding forever.
They even think the expansion is speeding up. But scientists are still studying
this question.
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