What is a Black Hole? In Simple terms

image of a black hole
Artistic view of a black hole

Universe is full of beautiful and mysterious objects which have always amazed astronomers. One of the most mysterious objects is black hole. What is a black hole? Is it really a hole or what? Does it look black in color? What are the properties of a black hole? Some people ask, “Are these objects really exist in nature?” In this post we will try to understand what a black hole really is and its effects on space, star and objects around it. We will also try to learn the relation between black holes and evolution of universe. Continue reading “What is a Black Hole? In Simple terms”

Celestial Sphere – The Equatorial Coordinate System

Earth within Celestial Sphere
The Earth within Celestial Sphere. Source: Wikipedia

The Equatorial Coordinate System is used to locate the position of star on Celestial Sphere. The Equatorial Coordinate System is similar to the coordinates of longitude and latitude that we use to locate the position of any place on the surface of Earth. Let us first learn how to locate an observer on the surface of Earth.

We know that Earth moves from West to East along an axis which Continue reading “Celestial Sphere – The Equatorial Coordinate System”

What is a Nebula?

Carina Nebula
Nebula are huge clouds of gases. Carina Nebula photographed by Hubble Telescope

Sky is full of interesting objects, one of which is nebula. You must have seen the beautiful images of nebulae like Crab Nebula, Orion Nebula, and Ring Nebula etc. These objects are named so differently because of their unique appearances which sometimes look like animals, eyes, rings and other familiar objects. Have you ever wondered what these beautiful structures are? How does such amazing structure form? Continue reading “What is a Nebula?”

What determines the color of a star other than temperature?

Omega Centauri
Colorful Stars Galore Inside Globular Star Cluster Omega Centauri. Credit: NASA, ESA, and the Hubble SM4 ERO Team

The stars are one of the wonderful objects in the sky which can be seen with naked eyes. When you look at the sky some stars appears brighter than others which may be either due to closeness of one star as compared to other or due to its bigger size. You also have observed that mostly stars appear white but some stars appear reddish and even bluish. Continue reading “What determines the color of a star other than temperature?”

Eta Carinae Nebula and star system explained by impressive 3D model of NASA

Eta Carinae Nebula
Eta Carinae’s great eruption in the 1840s created the billowing Homunculus Nebula.
Image Credit: NASA, ESA, and the Hubble SM4 ERO Team

Eta Carinae is one the most massive and luminous star system in the vicinity of 10000 light years around the solar system. The Eta Carinae star is known for its violet behaviours in the past. In the mid 19th century, it had become so violet and bright that it had become the second brightest star in the sky. During that time it ejected huge amount of mass that can be used to create 10 new Suns. The reason of that tremendous outburst is still not clear. The nebula created Continue reading “Eta Carinae Nebula and star system explained by impressive 3D model of NASA”

What is Supernova Explosion?

Supernova Explosion
Gamma rays released in the Supernova Explosion are harmful for life. (Credit: NASA)

Supernova explosion is one of the violent explosions of the universe which outshines the entire galaxy. The supernova explosion releases tremendous amount of energy and light into the interstellar medium. The brightness of supernova is so large that it can be seen from the billions of light years away. The brightness of supernova is sometimes even larger than the brightness of galaxy in which it occurred. The supernova also releases radiations like gamma rays which can be  Continue reading “What is Supernova Explosion?”

Pulsar a Neutron star with incredibly high magnetic field

Neutron star
Pulsars are Neutron stars with extremely
high magnetic field. (Credit:Dana Berry/NASA)

Pulsars are one of the mysterious objects of the universe. Pulsars are known for their extremely high magnetic fields and regularly pulsating radio signals which appear as artificial signals. What is pulsar? Pulsars are special type of Neutron stars which spins few times in a second and have incredibly high magnetic field. Before we talk about Pulsars lets first discuss about Neutron star after all pulsar is nothing but a neutron star. Continue reading “Pulsar a Neutron star with incredibly high magnetic field”

Stellar Evolution: life of star

life of star
The energy is liberated due to nuclear reaction
happening in the core of star. ( credit: NASA)

Stars are one of the interesting objects of the sky. Stars are big balls of gas in which nuclear reactions are going on producing tremendous amount of energy and light. The life of all the stars starts in the same way from the nebula but death of stars occurs in different ways, some undergo peaceful death while others undergo violent explosions. The stars are the source of different type of chemical elements from which we, objects observed on the Earth and planets are formed. Thus the stellar evolution which involves stages of life of star is an important process. Continue reading “Stellar Evolution: life of star”

Origin of Elements in the Universe: An Evolution after Big Bang Explosion

Heavier Elements form inside the core of star through nuclear ( source: NASA)

The planet Earth contains various types of elements which form soil, rocks, air, vegetation, species etc. There are nearly 118 elements in the nature. Every element has its specific properties. You will be surprised to know that these elements were not formed at the time of Big Bang Explosion. After the Big Bang only lighter elements like Hydrogen and Helium were formed. Then how the rest of the element originated? How did the materials for formation of planets and asteroids get formed? Continue reading “Origin of Elements in the Universe: An Evolution after Big Bang Explosion”

Spectroscopy Technique for determination of composition of Sun

Composition of Sun
The sun consists of mainly
hydrogen and Helium.
(source: NASA)

Sky is full of beautiful objects which always attract human and give rise to curiosities. In your childhood, you must have been wondering what are these twinkling objects and what are they made up of? You must have heard or read that the researchers have discovered Hydrogen and Helium in Sun. So what do you think how do they know that? Have they gone to the Sun and brought the sample and then studied them to know about the composition of Sun? The answer is no because no one can go to the Sun and collect the samples. So how do they detect the composition of Sun or any other star? Continue reading “Spectroscopy Technique for determination of composition of Sun”