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Galaxies

Its really quite hard to realize how big the universe is! It’s composition, its size and so many stuffs. This universe carrying large number of galaxies and each galaxies carrying millions of stars all bound by a unique force known as gravitational force. Here our sun is just a star and we stay in a galaxy. There lies our solar system where our earth lies. Let’s see little more about galaxy in this page.
 
The Galaxy is a part of universe that comprises of collection of billions of stars, dust and gas that are bound by the gravitational force. It’s even studied that there are approximately 70,000 million or even more stars in universe.  There are many galaxies existing in the universe. The solar system in which our earth stands is in Milky Way galaxy.

 

Types

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Galaxies vary a lot in shapes, size, color and composition. If we go for their shapes they are of three types:

1) Elliptical Galaxies
2) Spiral Galaxies
3) Irregular Galaxies

Elliptical Galaxies shapes more like a elongated sphere. Well known Andromeda galaxy is one which shapes so.

Spiral Galaxy has lot more of sections that relys of components - bulge, disk and the halo. The M100 and M83 are the spiral galaxies examples.

Irregular Galaxies has no formal regular shape or any structure. The Irr I and Irr II are some examples.

Names

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There are many galaxies existing in universe. Some of the galaxy names are Andromeda Galaxy, Black Eye Galaxy, Bode's Galaxy, Cartwheel Galaxy, Cigar Galaxy, Comet Galaxy, Haog's Object, Pinwheel Galaxy, Virgo Galaxy, Milkyway Galaxy etc. Some of the nearest galaxies from earth are Milkyway Galaxy, Canis Major Dwarf, Sagittarius Dwarf Sphr, Ursa Major II Dwarf etc. These Galaxies are name after how it appears and have their own fixed constellations.

Scale

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When we go through the scale it actually should start from sun which takes 8 min for the light to travel. It would actually take 17 years to get into the sun. But the scale we are taking is not about sun or planets. Its all about the galaxy which has huge distance. If the spacecraft moves fastest as 60,000 km/hr will reach Alpha Centauri Galaxy which is 4.2 light years after 80,000 years. Galaxies are that far located to imagine and have their own scales.

The galaxy scale varies from one galaxy to other. The Milky way is approximately 10,000 light years and of 9.25 $\times$ 1017 km in diameter. The Andromeda Galaxy which is next to milky way galaxy is of 260,000 light years and has the diameter of 2.4 $\times$ 1019 km. The popular largest galaxies are IC 1101, NGC 262, BCG of Phoenix Cluster etc which has size of (2.2-2.8) $\times$ 106 light years.
More topics in Galaxies
Andromeda Galaxy Milky Way Galaxy
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