Consider a 3+1d universe described by the following line element where h is constant. for a comoving galaxy (i. e. its location is described by a fixed set of (a, y,*), will we observe cosmological redshifting of light?

What happens to light waves from a star as the star moves away from earth?

Two friends are having a conversation. anna says a satellite in orbit is in freefall because the satellite keeps falling toward earth. tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . who do you agree with and why?

What happens to an isotope during radioactive decay?