At present, human sky detectors can fly as far away as? A. Earth Moon system B. solar system C. Galaxy D. total galaxy

At present, human sky detectors can fly as far away as? A. Earth Moon system B. solar system C. Galaxy D. total galaxy


Pioneers basically fly outside the solar system. Due to lack of energy, they can't collect data. Travelers have already flown to the boundary of the solar system. Strictly speaking, it should be the solar system