Astronomy

                   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 Galax...

                                  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...