1961 - Venera program: Venera 1 becomes the first man-made object to fly-by another planet by passing Venus (the probe had lost contact with Earth a month earlier and did not send back data).

1961年的今天，维尼拉计划：维尼拉1号太空揣测船在经过金星后，成为首架人造的、能飞往其他星球的物体。

youdao

All four Cluster satellites will fly independently, controlled by radio contact with a ground station on earth, rather than talking among themselves about where they are.

ECONOMIST: Birds of a feather