It's exactly the same, velocity just has a vector. Did you really not know that?

Velocity is the same, but maybe not in space. There is zero gravity.

You've never taken physics have you? Let me explain. Speed is a scalar, meaning it has a value, but no direction. Velocity is a vector, meaning it has direction and a value. The formula is still d/t. Gravity is a force. In an environment with no gravitational force, then according to newton's first law, it would continue unless acted upon by an outside force. On earth, that outside force is air resistance, friction, gravity, etc. Any force would affect the value of speed and velocity the same, because the value is the same. But then again, I doubt this will make sense to you

There is no environment without gravity. What we sense as a lack of gravity is actually free fall. The astronauts in the ISS are not in a gravity free environment, they are just falling.