SPIRAL GALAXY

                  SPIRAL GALAXY
Spiral Galaxies are looking like a round cycle. Spiral galaxies get their name from the shape of their discs. In this type of GALAXIES basically have a place named "galactic bulge" it is the central bright region of the galaxy, which Brightness is very high. In Spiral galaxies, near Spiral arm, a region presents, named HALO.
                                                                                                      Spiral - galaxy originally described by Edwin Hubble.
Most Spiral galaxies consist of a flat, rotating disc containing Stars, dust and Nebulae  and it's center is known as Bulge.

Sub Categories Of Spiral Galaxy:- 

Spiral Galaxies are divided into sub categories:-
  
A. S0  Galaxies: It is basically the mixture of Spiral and Elliptical galaxy. It works like a bridge between the two galaxies classification.

B. Sa Galaxies: It is a thin and tight arm of normal spiral galaxies. NGC - 1302 and NGS - 4866.
Those who can be seen clearly. The best examples of Sa Spiral Galaxy is

 C.Sb Galaxies:- This type of Spiral galaxies have medium size NUCLEAS NGS - 891.
and it's arms are more larger than other galaxies like this, but having moderately wound arms. For Example :-

D.Sc Galaxies :-  Sc- Galaxies have very loosely wound arms around a smaller nucleus.
This is the category of Spiral - Galaxy, which is classified on the basis of their Dimension and Spectra.

The Spiral galaxies get their name from the shape of their disks. Since Spiral galaxies have a lot of hot and young stars, they are often among the brightest galaxies in the universe.

Structure of Spiral - Galaxy:-

Spiral galaxies have three main components:-

. BULGE,
.DISK and
.HALO


 Bulge : The Bulge is a spherical Galaxy situated in the center of the galaxy.

Disk : The disk is made up of dust, gas and younger stars.The disk forms arm structures.

Halo : The Halo contains old clusters of stars known as Globular Clusters.

  About 20% of all galaxies are spiral. Our galaxy is also spiral, called Milky - Way.

 MILKY -  WAY : - The Milky - Way is our galaxy, where we live.Our amazing galaxy is unique and beautiful. The sun and it's plane t lie in this quiet part of the Galaxy.
          


Our galaxy looks like a faint, milky band stretching across the sky. The galaxy contains more than Stars.
                             






Comments

  1. Abhishek Singh21 May 2019 at 22:38

    Your post is amazing and knowledgeably and know us lots of information about the atmosphere where we live.
    can you make one blog on origin of our milkey-way...

    ReplyDelete

Post a Comment

Popular posts from this blog

THE SUN

Image
                                  SUN The Sun  is the star  at the center of the Solar - system, ' The HEART of our Solar - system'.  It is a yellow dwarf star.   The Sun gives life to the  Earth  and the Earth would have no life at all without the energy it receives from the Sun. WHAT IS THE SUN MADE OF? All stars are made out of gas and plasma. The Sun consists mostly of hydrogen and helium. It also has some carbon, oxygen, nitrogen and small amounts of other gases.                                    In the center of Sun, there is a process called Nuclear Fusion. During nuclear fusion, hydrogen atoms become helium. That means that the hydrogen is slowly being turned into helium. WHAT TYPE OF STAR IS IT? Astronauts classify stars based on the In this system, stars are assigned a letter: O, B, A, F, G, K or M . Stars are grouped into these classes based on their color and / or temperature .The Sun is a class G star. Morgan - Keenan system. HOW BIG IS TH
Read more
Image
                           ASTRONOMY  Astronomy  (from  Greek :  ἀστρονομία ) is  a  natural science  that studies  celestial objects and  phenomena . It applies  mathematics ,  physics , and  chemistry  in an effort to explain the origin of those objects and phenomena and their  evolution . Objects of interest include  planets ,  moons ,  stars ,  galaxies , and  comets ; the phenomena also includes  supernova   explosions,  gamma ray bursts ,  quasars com ,  blazars ,  pulsars , and  cosmic microwave background radiation . More generally, all phenomena that originate outside  Earth's atmosphere  ki  are within the purview of astronomy. A related but distinct subject is  physical cosmology , which is the study of the  Universe  as a whole. [1]
Read more

EARTH

Image
The Earth is the third planet from the Sun in the Solar - system. The Earth is the only planet in the Solar - system known to harbor life.   LIFE ON EARTH The Earth's temperature, atmosphere and many other factors are just right to keep us alive. The Earth is just for enough away from the Sun, that it is at the right temperature to have liquid water on it's surface. In fact, most of Earth's surface is covered in  water,  which is very  important  for  living things. SIZE OF THE EARTH The Earth is the biggest of all the terrestrial  planets. but the Earth is much smaller than the gas planets, like Saturn and Jupiter, that are in the outer Solar - system. If you cut a piece of string long enough to wrap it around the Earth, it had be 24,901 miles long. That's longer than 365,000 Football fields. THE EARTH'S ORBIT AND ROTATES The Earth is still 93 Million Miles away from the sun. since it's so far away. it takes the earth a
Read more