Nebula

         A nebula is a cloud, which is placed in interstellar space. Interstellar space means the space between two galaxies.

        There are five types of cloudy or Nebulous objects in the sky. As Given below,

Types of Nebula

                A nebula is cloud-type a structure that contains approximately 74% hydrogen, 25%helium, 1% other, and sun radiations. There are different types of nebulas star-forming nebulas and cloud nebulas. In every type of nebula structure particles of gas, dust, and sun radiations are combine to form a single big particle.

            Nebulae are where stars are born & are also created when they die.               As we have known, Every particle of matter attracts every other particle of matter,

                                                   GMm

                                     F  =   ---------------

                                                     r^2

Nebula

Where,

              F = Force of attraction.

              G = Gravitational attraction.

             M = mass of 1^ST particle.

             M = mass of 2^nd particle.

             R = radius of particle

             

  This formula is applicable like this, That cloud of the nebula which requires many particles of hydrogen and helium, Which are attracts and combine to form a molecule to maximize in every nebula, The density of that nebula is mole per cubic centimeter (mole/Cm^2).

Planetary Nebula

                When the particles of the nebula are attracted then its density and gravitational force of attraction are gradually increases. Then at a specific place, it takes place as a planet of gas. Then because of continuous particular attraction density of that cloud increases continuously as well size gradually decreases. Hence, the universal gravitational constant of that cloudy planet is increased. Because of these conditions, there is atomic combustion takes place and a small or newly born Red star is forms. After some billion years it transforms itself into an average star. Then again after some million years, it takes place as a red giant & gradually increases its size. After releasing its energy then it forms a planetary nebula & after some time because of the gravitational force it converts into a white dwarf star.

Black Hole

Dwarf Planet

            This is a one way of after stellar nebula & another way is after nebula forms a massive star. after some million years its transforms into a super red giant. because of the maximum force of attraction & internal pressure created by density, a bigger explosion takes place, which we called a supernova explosion. after supernova it can form a neutron star or black holes, however, it becomes a neutron star or black hole which is depend’s upon the mass & density of a star

Formation Cycle Of Star

The biggest size of interstellar nebula is can be some light-years. Today discovered biggest nebula is Tarantula Nebula which size Is around 1800 light-years.

Tarantula Nebula

The Helix Nebula is the closest planetary nebula to the earth. it is approximately 7000 light-years away from the earth.it is formed when a dying star threw off its outer layers, which are gradually expanding into space.

Helix Nebula

The NGC 7027 is very young & dense planetary nebula located as round 3000 light-years from the earth, in  the constillation Cygnus.this is one of the smallest nebula & by far the most extensively studied.

NGC 7027 Nebula