Cosmic distances, Science

Assignment Help:

Cosmic Distances:

If  we asked you what the distance between Delhi and Kanyakumari is, you would say that it  is roughly 3000 km. Another way of answering the question would be that a train  takes.about 50 hours to cover the distance. And if  we know the average speed of a train, we would get a fairly good idea of  the distance. The dimensions of  the universe are so large that using familiar units of distance like kilometres would make little sense, Therefore, cosmic distances are measured in'"ight years". One  light year is the distance travelled by  light.  in  one year. Now, light travels,  about 300,000 kilometres in one second, i.e.  its speed is 3  X 105 kms. At this sped  it can travel seven times around the Earth in one second. A year has about 3X  107seconds (i.e.  about 30 million seconds) in it. Therefore, the distance light travelsin one year is about 

3  X 105m/s  X  3 X 107s=9  X 102km, i.e. about nine trillion kilometres. 

This unit of  length  is called a light year, It measures not time but distances, enormous distances. Space and time are interwoven. We cannot look out into space without looking back  into time. If we see a galaxy a billion  light years away, we are seeing it  theway it was a billion years ago. Thus, the distance  in  units of  light years also tells us how far back  into time we are looking.  


Related Discussions:- Cosmic distances

Explain the porphyrins in the urine, Explain the Porphyrins in the urine ...

Explain the Porphyrins in the urine Porphyrins (a group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration

Explain amino acids, Amino acids are the building blocks of proteins. All ...

Amino acids are the building blocks of proteins. All proteins consist of a sequence of amino acids,  which  are compounds containing  an  amino group  (-BIB)  and  a carhoxyl  gro

Role of antibody mediated immune system, Role of Antibody Mediated Immune S...

Role of Antibody Mediated Immune System The AMlS defends the body against free viruses, bacteria with polysaccharide capsules and toxins that enter the body fluids (blood and l

Explain the control of salivary secretion, Explain the Control of Salivary ...

Explain the Control of Salivary Secretion The autonomic control of saliva secretion occurs in two ways, as unconditioned and conditioned reflex. What are these? Let's find out.

Rockets or launch vehicles, Rockets or Launch Vehicles: Every flight in...

Rockets or Launch Vehicles: Every flight into space begins with a rocket launching. The rocket can lift a satellite or spaceship  carrying human beings and equipment into space

What is the greenhouse effect, Q.What is the greenhouse effect? Some gas...

Q.What is the greenhouse effect? Some gases like carbon dioxide, methane, nitrous oxide prevent the escape of heat from the Earth's surface by trapping it. This increases the av

Need for code of behaviour for laboratory staff, Need for Code of Behaviour...

Need for Code of Behaviour : A laboratory is a potentially dangerous working environment. Cuts from broken glass, chemical or thermal burns and poisoning are three examples of lab

Polarizable electrode, can you give explanation on RPME and its working

can you give explanation on RPME and its working

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd