Cosmic distances, Science

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.  

Posted Date: 9/28/2012 1:18:32 AM | Location : United States







Related Discussions:- Cosmic distances, Assignment Help, Ask Question on Cosmic distances, Get Answer, Expert's Help, Cosmic distances Discussions

Write discussion on Cosmic distances
Your posts are moderated
Related Questions
Explain what Diffusion is? Diffusion, we learnt is a simple process of movement of individual molecules from one region to another. Figure illustrates passive transport where m

please explain cholecsystikinin and the gallbladder functions

how a student nurse can apply the knowledge of mental health and mental hygiene in her personal and professional life

why does water erupt from geysers?

Walking Robots: Sit back  for a while and  try  to think of a few advantages our legs have over wheels  in moying around. Wheels can't  climb stairs. They can't also step ove

Nutrient groups and their functions: We should know that our body is made up of different chemical substances which are related to the food we take. Scientists have determine

how do we arrange element in a periodic table

Communication Revolution: It is in this background, that communication revolution is being ushered in ou:  country. In the recent years, the rural people who have access to T

1.  Explain the fundamental scientific principles, including basic principles of chemistry and physics. 2.  Give an example that applies scientific principles to the study of zo

informations about reproduction