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# Relativity/time

Question
QUESTION: how time is related to space?

ANSWER: Praveen, the answer is simpler than you think. Time and space are related by velocity. You can say that two points are so many kilometers apart or by so many hours apart, given a velocity of travel.

Is there some other question you had in mind?

Ben

---------- FOLLOW-UP ----------

QUESTION: two stars if seperated by a large distance appears to be so close for a distant observor is it so? why does it happens? what is the reason for dilation theory?

If two stars are a large distance apart, then an even more distant observer sees a small angular separation, not a small linear separation, because of the distance from him. There is no relativity going on here.

The dilation you are talking about has to do with moving observers, not just distant observers, and concerns time separation between two events, as well as distance separation.

The reason for time dilation is just that Einstein derived relativity and experiments show him to be correct. Physics cannot answer "why questions" any better. Why does gravity exist? Physics cannot say. Some people will give answers from religion, not physics.

Ben

Relativity

Volunteer

#### Uncle Ben

##### Expertise

I can answer questions regarding Einstein's Theory of Relativity, particularly in Special Relativity. I will not answer homework questions or mathematical problems that require special symbols.

##### Experience

I have taught physics at the college level, undergraduate and graduate, for many years including Special Relativity. I have taught at Johns Hopkins, Case-Western, and MIT. I have also served as a staff member of the Commission on College Physics, which was supported by the National Science Foundation to recommend improvements in the curriculum of college physics departments in the US. I am also the author of a textbook titled Vector Calculus, which was used at MIT in the teaching of electromagnetic theory and relativity. My research interests were mainly in solid state physics, especially the properties of metals at low temperatures. I am listed in the publication known as American Men of Science.

Publications
I have dozens of papers published in the Physical Review and in the American Journal of Physics.

Education/Credentials
I hold a Ph.D. degree in physics from the Johns Hopkins University.

Past/Present Clients
Johns Hopkins University, Case-Western Reserve University, Massachusetts Institute of Technology, Empire State College, Georgetown University, Commission on College Physics, and UNESCO.