Is our mind faster than light? Here is what I have been told by some Thai followers:

The sun's light takes 8 minutes to reach the Earth, but our mind can think of the sun or even of distant stars instantly. That is to say, our mind is faster than the speed of light. They claim science is a subset of Buddhism. 

Is this true or false?
The key point here is that the concept of speed is dependent on space (speed = distance/time, distance = spatial position B - spatial position A), which in turn is a derived product of matter. 

Mind, being immaterial (and moreover momentary), does not "move", per se. It arises based on one of the six senses and ceases in the next moment. It never takes up space, nor can it be said to "move" in ultimate reality.