There are hundreds of billions Galaxies are huge
collections of stars, gas and dust in the universe .Each galaxy may consist of
hundreds of billions of stars and other heavenly bodies. In the center of
galaxies is where stars are more concentrated. Each body of a galaxy is moving
because of the attraction of others. In general there is also a broader
movement that makes everything turn around the center together
.
Neighboring
galaxies Distance (light years)
Magellanic
Clouds 200,000
The
Dragon 300,000
Little
Bear 300,000
The
Sculptor 300,000
The
Cooker 400,000
Leo 700,000
NGC
6822 1,700,000
NGC
221 (M32) 2,100,000
Andromeda
(M31) 2,200,000
The
Triangle (M33) 2,700,000
Sizes
and shapes of galaxies
There are huge galaxies like Andromeda, or small
like its neighbor M32. The balloon is shaped; lens, flat, elliptical, spiral
(like ours) or irregular shapes. Galaxies are grouped to form "clusters of
galaxies." The nearest large galaxy is Andromeda. It can be seen with the
naked eye and looks like a hazy patch of light aspect. Arab astronomers had
already observed. Today it is known under the designation M31. It is about
2,200,000 years light of us. It's twice as big as the Milky Way.
Galaxies
have a foundation and growth
The primary galaxies begin form 1,000 million years
after the Big Bang. The stars that form have a birth, a life and death. The
sun, for example, is a star formed by elements of previous stars dead. Many
nuclei of galaxies emit strong radiation, which indicates the likely presence
of a black hole. The motions of galaxies cause sometimes violent clashes. But
in general, galaxies away from each other, as plotted points on the surface of
a balloon that is inflated.
No comments:
Post a Comment