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

Lipid case study, 2. Explain why KB has a low level of serum ketoacids? (4...

2. Explain why KB has a low level of serum ketoacids? (4 points)

Explain the selective reabsorption process, Explain the Selective Reabsorpt...

Explain the Selective Reabsorption Process 1. Specialized proteins called 'transporters' are located on the membranes of the various cells of the nephron. 2. These transport

Marasmus, Marasmus: This is caused due to the severe deficiency of bo...

Marasmus: This is caused due to the severe deficiency of both proteins and calories in the diet. Nutritional surveys among pre-school (1 to 5 years) children show that more t

A lamp chimney lift pump, A lamp chimney lift pump Use a straight-sided...

A lamp chimney lift pump Use a straight-sided lamp chimney as a pump cylinder. Fit a two-hole stopper into the chimney for a piston. If the stopper is a little small wrap some

Studying broken rocks with a magnifying glass, Studying broken rocks with a...

Studying broken rocks with a magnifying glass Study freshly broken rocks with a magnifying glass and try to find crystals of dissimilar minerals. The crystals of dissimilar mi

Materials and processes in design, a manufacturer of fasteners uses a four ...

a manufacturer of fasteners uses a four die nut former to produce blanks and the piercer punch began to break down using stainless steel bar stock. what change can be made so the m

two forms of oxygen found in the atmosphere, Q.What are the two forms of o...

Q.What are the two forms of oxygen found in the atmosphere? The two forms of oxygen found in the atmosphere are: (i) Diatomic molecular form with chemical formula O 2 . (i

Chemical hazards, CHEMICAL HAZARDS : Chemicals are present in all laborato...

CHEMICAL HAZARDS : Chemicals are present in all laboratories. It is good to consider all chemicals toxic and flammable unless one has definite information regarding its nature. Ou

Treatment and disposal scope of first aid, Treatment: First aid treatment ...

Treatment: First aid treatment is a set of actions taken to preserve life of the casualty, prevent the conditions from becoming worse and promote his/her recovery. Disposal:

Physiology, Monosaccharides and amino acids are absorbed into the blood in ...

Monosaccharides and amino acids are absorbed into the blood in the intestinal capillaries. Is it true or False?

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