world of astronomy ahead

What exactly a galaxy? A galaxy is a gravitationally bound stable system consisting of billions of stars, planets, dust, gases and remnants of other heavenly bodies. Some scientists believe that there could be as many as one hundred billion galaxies in the universe. Millions of stars together separated by a large distance from a galaxy. Nearly all large galaxies have a supermassive black hole at their centre.  Milky Way galaxy also has a supermassive black hole at its centre known as  Sagittarius A* . When we look up in the night sky we see the stars,  these are the stars that reside inside the milky way galaxy. if it's really dark, far away from the lights of the cities and buildings we can actually see the dusty band of the Milky Way stretch across the star. Types of galaxies 1.)  Spiral galaxy This is the class of galaxy in which the stars and gas clouds are mainly concentrated in one or more spiral arms. Most spiral galaxies are consist of a flat, rotating disk

What is a black hole ? A black hole in space is a region where the gravitational force is so strong that even light can not escape it.  Any matter which comes under the influence of a  black hole will be crushed down to a confined space and is being eaten by the black hole.  Black holes are formed when a star dies. Not every star can become a black hole only which have mass 1.4 times the mass of our sun. ( approx   2.8E30). A few black holes are orbited by the other heavenly bodies and are slowly eaten away by the black holes.  As the matter falls towards the event horizon it gets heated due to the increasing gravitational pull and the friction and forms a bright circular disc around the black hole known as Assertion disc .   On the basis of mass and sizes black holes has been divided into four categories:- 1.) Stellar black holes   When a star with a mass range from five to several tens times of the solar masses collapses due to its own gravitational force

  Artist’s conception of the extrasolar ring system circling the young giant planet or brown   dwarf J1407b. The rings are shown eclipsing the young sun-like star J1407, as they would have appeared in early 2007. Credit:   Ron Miller J1407b is the first brown dwarf planet discovered with the rings by the transit method. The star is situated in the constellation of Centaurus with at a distance of 433.8 light-years away from the earth. It was discovered by Eric Mamajek (an American astronomer). It is also known as the super Saturn because it has a ring-like structure around it comprising of gas, dust, and ice like Saturn. The ring system is roughly 200 times  larger than Saturn. However, the planetary science community has theorized for decades that planets like  Jupiter and Saturn had rings around them at the early stage of their formation that led to the formations of their natural satellite that we see today. Until this planet was discovered  it was hard for someone

1.)   Gliese 667Cc  Gliese 667Cc is an exoplanet found on 21 November 2011. It is the member of a triple star system Gliese 667. It is situated in Scorpius constellation approximately 23.61 light-years away from the planet earth.  It has an orbital period of  28 earth days. It is also known as  HD 156384Cc. The exoplanet was found using the radial velocity method.  It is approx 3.7 times heavier than the the earth.  2.)   Kepler-186f It was found on 17 April 2014 by Elisa Quintana. Kepler-186f is an exoplanet orbiting a red dwarf 582 light-years away from the earth. It has a radius of 7,454.1 km with an orbital period of 130 days. It is the first planet with discovered in habitable zone which has a roughly equal radius with that of our earth. The discovery of Kepler - 186f confirms that the habitable planets like our earth exists somewhere in the universe.  Kepler-186f is situated in the constellation of Cygnus. Although the size of Kepler-186f is known but its