gk lokam: Astronomy
Showing posts with label Astronomy. Show all posts
Showing posts with label Astronomy. Show all posts

16 February 2020

ISRO-Indian Space Research Organization

ISRO-Indian Space Research Organization

The Indian Space Research Organisation (ISRO) (Hindi; bhārtīya antrikṣ anusandhān saṅgṭhan) is the space agency of the Government of India and has its headquarters in the city of Bengaluru.

5 November 2019

Planets Earth and Mars

Planets Earth and Mars


Distance from the sun : 150 million km
Period of Revolution : 365 days hrs 48 min 45 sec
Period of Rotation : 23 hrs 56 min 4 sec
Escape Velocity : 11.2 km/sec
Diameter : 12,756 km
Polar diameter : 12713 km
Age : 4.6 billion years old

Star, Origin of Stars,Types of Star

Star, Origin of Stars,Types of Star


The stars which lies immediately above the earth's North pole and around which all other stars seems to revolve is called 
Ans : Pole Star

Evolution of Universe

Evolution of Universe

Origin of Universe

There are three main theories put forward to explain origin and evolution of universe.


Most widely accepted theory regarding the origin of universe
Ans : Big Bang Theory

Big Bang Theory was proposed by
Ans : George Lemaitre

Big Bang Theory was modified by
Ans : Edwin Hubble

The term big bang was coined by
Ans : Fred Hoyle

Big bang theory is also called as
Ans : Expanding Universe Hypothesis


Steady State Theory was proposed by
Ans : Hermann Bondi, Thomas Gold and Fred Hoyle

Steady State Theory was proposed in
Ans : 1948

Quasi Steady State Theory was proposed by
Ans : Jayant Narlikar


The Pulsating Theory was proposed by
Ans : Dr. Allan Sandage

The theory which proposed that at present universe is expanding
Ans : Pulsating Theory


A galaxy is a vast collection of billions of stars, dust, gas and empty space held together by
Ans : Gravitational force

The word galaxy was first introduced by
Ans : William Herschel

First person to calculate distance between galaxies
Ans : Sir Edwin Hubble

There are about 5Q billion galaxies exist in the universe
Group of galaxies is known as
Ans : Cluster

The most distant object visible to naked eye in the universe
Ans : Andromeda Galaxy

Our sun and its planets belongs to the
Ans : Milky Way Galaxy or Akash Ganga

First astronomer to demonstrate the existence of galaxies beyond milky way
Ans : Edwin Hubble (1924)


1.Spiral Galaxies
2.Elliptical Galaxies
3.Irregular Galaxies

The galaxy having central nucleus with great spiral arms
Ans : Spiral Galaxy

Milky way and Andromeda are the examples of
Ans : Spiral Galaxies 

New stars are formed in Spiral Galaxies Largest spiral galaxy
Ans : Andromeda Galaxy

The farthest object which can be seen with naked eyes
Ans : Andromeda Galaxy

The milky way belongs to a cluster of galaxies called
Ans : Local group

The galaxies having no spiral arms are called
Ans : Elliptical,Galaxies

Red Giants and white dwarfs are seen in the
Ans : Elliptical Galaxies 

Dim collection of old stars are seen in the
Ans : Elliptical Galaxies 

Galaxies having no regular shape
Ans : Irregular Galaxies 

Large Magellanic cloud is an
Ans : Irregular Galaxy

1 October 2019

Solar System: Sun and the Eight Planets

Solar System: Sun and the Eight Planets

Solar System

The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids  form the solar system.

 We often call it a solar family, with the sun as its Head.

11 September 2019

Celestial Bodies, Stars,Constellation,Planets-Astronomy Notes

Celestial Bodies, Stars,Constellation,Solar System-Astronomy Notes

What are Celestial Bodies?

The sun, the moon and all those objects shining in the night sky are called celestial bodies.


Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars

 eg:- Sun

What is called a Constellation?

Constellations are the various patterns formed by different groups of stars. 

eg:- Ursa Major or Big Bear 

 One of the most easily recognisable constellation is the Saptarishi (Sapta-seven, rishi-sages). It is a group of seven stars that forms a part of Ursa Major Constellation. 

Pole Star/North Star

In ancient times, people used to determine directions during the night with the help of stars. 

The North star indicates the north direction. It is also called the Pole Star. 

It always remains in the same position in the sky. 

We can locate the position of the Pole Star with the help of the Saptarishi.



Planets are the celestial bodies do not have their own heat and light. 

They are lit by the light of the stars. 

  The word ‘planet’ comes from the Greek word “Planetai” which means ‘wanderers’.

for example, the earth on which we live is a planet. It gets all its heat and light from the sun, which is our nearest star.

If we look at the earth from a great distance,  it will appear to be shining just as the moon.



The celestial bodies that moves around the planets.

The moon that we see in the sky is a satellite. It is acompanion of our earth and moves round it. 


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