Key insight for everyone hooked to the livestream of planes landing at Heathrow Airport.
The aircraft, which had 38 people on board, went missing on Monday.
The Air Accidents Investigation Branch is trying to establish what happened to the aircraft.
It's the first time such an aircraft will be used on another planet.
Stratolaunch is wider than a football pitch and weighs a staggering 500,000 pounds.
Wreckage from the plane has been washed ashore.