Einstein's Theory - Is Moving Away at Speed 'c' Constant Time?

[gpsinghsandhu]

I saw in some video that acc. to the theory if we move away from a clock with a speed 'c', then we would see a constant time. Is it correct? Please explain..

 

[ghwellsjr]

If you could move away from a clock at speed c and you were looking back at the clock, isn't it obvious that you would continually see the same image of the clock, ie, not changing?

 

[bcrowell]

I saw in some video that acc. to the theory if we move away from a clock with a speed 'c', then we would see a constant time. Is it correct? Please explain..

By "constant time," do you mean that the clock reading would stand still? No, it wouldn't stand still, but you would see the clock as running slower.

If you want to get started on special relativity, a book I always recommend to people is Relativity Simply Explained by Gardner.

 

[JesseM]

By "constant time," do you mean that the clock reading would stand still? No, it wouldn't stand still, but you would see the clock as running slower.

The question was specifically about moving away from the clock at c, not just a fraction of c, so I think the correct answer--as you have noted in other discussions--is that relativity doesn't allow us to talk about the point of view of an observer moving at exactly c (it would be impossible to accelerate any observer to c, and photons don't have their own rest frame or a way of measuring time)

 

[bcrowell]

The question was specifically about moving away from the clock at c, not just a fraction of c, so I think the correct answer--as you have noted in other discussions--is that relativity doesn't allow us to talk about the point of view of an observer moving at exactly c (it would be impossible to accelerate any observer to c, and photons don't have their own rest frame or a way of measuring time)

Oops, I missed the fact that the OP said at c. You're right, of course.