Which of the following is true regarding the expansion of the universe? Mark all that apply.多项选择题

We only see the expansion at large scales because gravity goes to 0 outside of galaxies

We can watch the trajectory of galaxies to determine where exactly the center of the universe is

Galaxies can move away from us at speeds faster than the speed of light due to the expansion of space

There is no center of the universe, the expansion looks the same from every location

Some galaxies are actually much further away than they appear

The Hubble law is no longer valid when galaxies appear to move faster than the speed of light