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The Milky Way galaxy
in the Southern hemisphere |
The Milky Way is a spiral galaxy which is the home of our Solar System together with at least 200 billion other stars, their planets, thousands of clusters and nebulae.
A spiral galaxy can be described as having a bulge in the center, surrounded by a disk (flat, moving) and spherical halo.
Compared with other galaxies, the Milky Way is very large - its mass is probably between 750 billion and one trillion solar masses, its diameter about 100,000 light years.
Galaxies, which are made up of stars, gas and dust, rotate very slowly. Our Sun, one of many stars in our Milky Way Galaxy, completes a circuit around the Milky Way every 250 million years.
The term "milky" originates from the hazy band of white light appearing across the celestial sphere visible from Earth, which comprises stars and other material lying within the galactic plane. The Greek philosopher, Democritus (450 BC – 370 BC) was the first known person to claim that the Milky Way consists of distant stars.

Spiral Galaxy M81: Photo by Hubble Space Telescope.
This is a spiral galaxy which is similar to our Milky Way galaxy.
It is 11.6 million light-years away.
A
supernova is a stellar explosion that creates an extremely luminous object
that is initially made of plasma - an ionized form of matter. A supernova
may briefly out-shine its entire host galaxy before fading from view over
several weeks or months. During this brief period of time, the supernova
radiates as much energy as the Sun would emit over about 10 billion years.
The explosion expels much or all of a star's material at a velocity of
up to a tenth the speed of light, driving a shock wave into the surrounding
interstellar gas. This shock wave sweeps up an expanding shell of gas and
dust called a supernova remnant.
Modern physics understands quasars to be extremely bright
and distant active nucleus of a young galaxy. They were first identified
as being high-redshift (thus very distant) sources of electromagnetic energy,
including radio waves and visible light that were point-like similar to
stars rather than extended sources similar to galaxies.
However Halton
Arp clearly shows in his book 'Seeing Red' that these supposedly very
distant objects are actually part of much closer constellations - proving
that their high redshift is not related to distance and thus contradicting
the standard 'Big Bang' theory of cosmology. His work is now suppressed
in the USA (he was banned from using their telescopes) and he works at
the Max Planck institute in Germany. A sad insight into the state of modern
physics and its suppression of the truth to maintain existing beliefs over
empirical facts.
Discover the amazing beauty of the cosmos!
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Sombrero Galaxy, M104, NGC 4594
Spiral Galaxy, 28 million light-years away.
Based upon;
http://seds.lpl.arizona.edu/messier/more/mw.html
http://en.wikipedia.org/wiki/Milky_Way
Images from;
http://heritage.stsci.edu/gallery/galindex.html