David's FaceTime

In the early parts of Prometheus I recall David having what seemed to be a live video-chat session for language lessons. That entire sequence suggested to me that he has been doing this routine for sometime (before they reached their destination) & I was wondering: If they are able to communicate directly to earth from such a distance, couldn't they have communicated back some data/video to earth after they found the dead engineer? Or after the bizarre zombie breakout & subsequent deaths? I may have missed something but it seemed that their technology was allowing for such communication even far into their journey & personally was wondering if back on earth they did get this data & learned about SJs/Xenomorphs from this mission? Your thoughts please my fellow nerd-community.