# Can a Black Hole be moved by lasers?

I've read that an object colliding with a black hole will move it, as it would any other object. Could a laser continuously fired into a black hole move it?

• FWIW, the Sun's luminosity is $\approx 3.828×10^{26}$ watts. We can use $E=pc$ to calculate the light's momentum, and equate it to $p=mv$ for the change in momentum of the black hole (this ignores the small change in mass of the BH due to absorbing the light). If we blast a small 3 solar mass BH with the entire solar output for 1 million years, we increase its speed by ~6.75 m/s. Nov 9, 2021 at 13:52