It's hard to answer it. But, i can say that; if we think the universe like a baloon, then, we don't know the exact diameter of this baloon, we don't know how much the universe wide. Because it expanded with a very high speed in omni direction, not higher than light speed. But the expanding speed...
Thank you all guys.
So two masses move away from each other with a speed of 99 percent of lightspeed according to the observer in one of them.
It is ok but still i am in confusion. Here we don't add two speed. This formula is for the speed of a walking passenger in a moving train. Here, in...
Hello.
Let's say we have two masses, each moving in 90 percentage of light speed in opposite direction.
Then what will be the speed of the one mass according to an observer in the other mass?