NASA JPL just made public that on May 8, 2018 the first interplanetary CubeSats called Mars Cube One (MarCO) reached 621,371 miles (1 million kilometers) from Earth. “CubeSats have never gone this far

First interplanetary CubeSats designed to monitor InSight landing are already on the way to Mars. NASA has received radio signals indicating that the first-ever CubeSats headed to deep space are alive