three-legged race
race
in which competitors run in pairs, the right leg of one runner being tied to the left leg of the other 三足赛跑(参赛者两人一组, 将一人左腿与另一人右腿绑在一起跑).
Even a telescope in orbit round the earth, like the very successful Hubble telescope, would not be suitable because of the dust particles iron solar system.