Ok, then how much mass would be required for them to attract each other? Same answer. The influence of any mass is universe-wide, but not instantaneous (speed of light). Of course in the real universe there are other forces at play, like solar wind, the gravity of other bodies, etc. So it would actually be very difficult to observe. Consider your own mass as the observer.

Also, if an astronaut could remain motionless, would the gravitational force from the space station pull him in? If motionless, then the earth would pull them both in rather more quickly.